Pass a errfunc to lua_pcall to get a traceback

9 files changed, 345 insertions, 281 deletions

diff --git a/src/script/cpp_api/s_base.cpp b/src/script/cpp_api/s_base.cpp
index e26d54ba7..b1272b64e 100644
--- a/src/script/cpp_api/s_base.cpp
+++ b/src/script/cpp_api/s_base.cpp
@@ -55,23 +55,6 @@ public:
 	}
 };
 
-static int loadScript_ErrorHandler(lua_State *L) {
-	lua_getfield(L, LUA_GLOBALSINDEX, "debug");
-	if (!lua_istable(L, -1)) {
-		lua_pop(L, 1);
-		return 1;
-	}
-	lua_getfield(L, -1, "traceback");
-	if (!lua_isfunction(L, -1)) {
-		lua_pop(L, 2);
-		return 1;
-	}
-	lua_pushvalue(L, 1);
-	lua_pushinteger(L, 2);
-	lua_call(L, 2, 1);
-	return 1;
-}
-
 
 /*
 	ScriptApiBase
@@ -133,7 +116,7 @@ bool ScriptApiBase::loadScript(const std::string &scriptpath)
 
 	lua_State *L = getStack();
 
-	lua_pushcfunction(L, loadScript_ErrorHandler);
+	lua_pushcfunction(L, script_error_handler);
 	int errorhandler = lua_gettop(L);
 
 	int ret = luaL_loadfile(L, scriptpath.c_str()) || lua_pcall(L, 0, 0, errorhandler);
@@ -144,7 +127,7 @@ bool ScriptApiBase::loadScript(const std::string &scriptpath)
 		errorstream<<std::endl;
 		errorstream<<lua_tostring(L, -1)<<std::endl;
 		errorstream<<std::endl;
-		errorstream<<"=======END OF ERROR FROM LUA ========"<<std::endl;
+		errorstream<<"======= END OF ERROR FROM LUA ========"<<std::endl;
 		lua_pop(L, 1); // Pop error message from stack
 		lua_pop(L, 1); // Pop the error handler from stack
 		return false;
@@ -159,19 +142,13 @@ void ScriptApiBase::realityCheck()
 	if(top >= 30){
 		dstream<<"Stack is over 30:"<<std::endl;
 		stackDump(dstream);
-		scriptError("Stack is over 30 (reality check)");
+		throw LuaError(m_luastack, "Stack is over 30 (reality check)");
 	}
 }
 
-void ScriptApiBase::scriptError(const char *fmt, ...)
+void ScriptApiBase::scriptError()
 {
-	va_list argp;
-	va_start(argp, fmt);
-	char buf[10000];
-	vsnprintf(buf, 10000, fmt, argp);
-	va_end(argp);
-	//errorstream<<"SCRIPT ERROR: "<<buf;
-	throw LuaError(m_luastack, buf);
+	throw LuaError(NULL, lua_tostring(m_luastack, -1));
 }
 
 void ScriptApiBase::stackDump(std::ostream &o)
diff --git a/src/script/cpp_api/s_base.h b/src/script/cpp_api/s_base.h
index 63f7e423f..75552cc34 100644
--- a/src/script/cpp_api/s_base.h
+++ b/src/script/cpp_api/s_base.h
@@ -31,6 +31,7 @@ extern "C" {
 #include "jthread/jmutex.h"
 #include "jthread/jmutexautolock.h"
 #include "common/c_types.h"
+#include "common/c_internal.h"
 
 #define SCRIPTAPI_LOCK_DEBUG
 
@@ -65,7 +66,7 @@ protected:
 		{ return m_luastack; }
 
 	void realityCheck();
-	void scriptError(const char *fmt, ...);
+	void scriptError();
 	void stackDump(std::ostream &o);
 
 	Server* getServer() { return m_server; }
diff --git a/src/script/cpp_api/s_entity.cpp b/src/script/cpp_api/s_entity.cpp
index cefa27cb1..c9d1bd8e0 100644
--- a/src/script/cpp_api/s_entity.cpp
+++ b/src/script/cpp_api/s_entity.cpp
@@ -78,25 +78,29 @@ void ScriptApiEntity::luaentity_Activate(u16 id,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	verbosestream<<"scriptapi_luaentity_activate: id="<<id<<std::endl;
 
 	// Get minetest.luaentities[id]
-	luaentity_get(L,id);
+	luaentity_get(L, id);
 	int object = lua_gettop(L);
 
 	// Get on_activate function
-	lua_pushvalue(L, object);
 	lua_getfield(L, -1, "on_activate");
-	if(!lua_isnil(L, -1)){
+	if(!lua_isnil(L, -1)) {
 		luaL_checktype(L, -1, LUA_TFUNCTION);
 		lua_pushvalue(L, object); // self
 		lua_pushlstring(L, staticdata.c_str(), staticdata.size());
 		lua_pushinteger(L, dtime_s);
 		// Call with 3 arguments, 0 results
-		if(lua_pcall(L, 3, 0, 0))
-			scriptError("error running function on_activate: %s\n",
-					lua_tostring(L, -1));
+		if(lua_pcall(L, 3, 0, errorhandler))
+			scriptError();
+	} else {
+		lua_pop(L, 1);
 	}
+	lua_pop(L, 2); // Pop object and error handler
 }
 
 void ScriptApiEntity::luaentity_Remove(u16 id)
@@ -123,14 +127,16 @@ std::string ScriptApiEntity::luaentity_GetStaticdata(u16 id)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	//infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
 
 	// Get minetest.luaentities[id]
-	luaentity_get(L,id);
+	luaentity_get(L, id);
 	int object = lua_gettop(L);
 
 	// Get get_staticdata function
-	lua_pushvalue(L, object);
 	lua_getfield(L, -1, "get_staticdata");
 	if(lua_isnil(L, -1))
 		return "";
@@ -138,11 +144,12 @@ std::string ScriptApiEntity::luaentity_GetStaticdata(u16 id)
 	luaL_checktype(L, -1, LUA_TFUNCTION);
 	lua_pushvalue(L, object); // self
 	// Call with 1 arguments, 1 results
-	if(lua_pcall(L, 1, 1, 0))
-		scriptError("error running function get_staticdata: %s\n",
-				lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 1, errorhandler))
+		scriptError();
+	lua_remove(L, object); // Remove object
+	lua_remove(L, errorhandler); // Remove error handler
 
-	size_t len=0;
+	size_t len = 0;
 	const char *s = lua_tolstring(L, -1, &len);
 	return std::string(s, len);
 }
@@ -192,10 +199,13 @@ void ScriptApiEntity::luaentity_Step(u16 id, float dtime)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
 
 	// Get minetest.luaentities[id]
-	luaentity_get(L,id);
+	luaentity_get(L, id);
 	int object = lua_gettop(L);
 	// State: object is at top of stack
 	// Get step function
@@ -206,8 +216,10 @@ void ScriptApiEntity::luaentity_Step(u16 id, float dtime)
 	lua_pushvalue(L, object); // self
 	lua_pushnumber(L, dtime); // dtime
 	// Call with 2 arguments, 0 results
-	if(lua_pcall(L, 2, 0, 0))
-		scriptError("error running function 'on_step': %s\n", lua_tostring(L, -1));
+	if(lua_pcall(L, 2, 0, errorhandler))
+		scriptError();
+	lua_remove(L, object); // Remove object
+	lua_remove(L, errorhandler); // Remove error handler
 }
 
 // Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
@@ -218,6 +230,9 @@ void ScriptApiEntity::luaentity_Punch(u16 id,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
 
 	// Get minetest.luaentities[id]
@@ -235,8 +250,10 @@ void ScriptApiEntity::luaentity_Punch(u16 id,
 	push_tool_capabilities(L, *toolcap);
 	push_v3f(L, dir);
 	// Call with 5 arguments, 0 results
-	if(lua_pcall(L, 5, 0, 0))
-		scriptError("error running function 'on_punch': %s\n", lua_tostring(L, -1));
+	if(lua_pcall(L, 5, 0, errorhandler))
+		scriptError();
+	lua_remove(L, object); // Remove object
+	lua_remove(L, errorhandler); // Remove error handler
 }
 
 // Calls entity:on_rightclick(ObjectRef clicker)
@@ -245,6 +262,9 @@ void ScriptApiEntity::luaentity_Rightclick(u16 id,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
 
 	// Get minetest.luaentities[id]
@@ -259,7 +279,9 @@ void ScriptApiEntity::luaentity_Rightclick(u16 id,
 	lua_pushvalue(L, object); // self
 	objectrefGetOrCreate(clicker); // Clicker reference
 	// Call with 2 arguments, 0 results
-	if(lua_pcall(L, 2, 0, 0))
-		scriptError("error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
+	if(lua_pcall(L, 2, 0, errorhandler))
+		scriptError();
+	lua_remove(L, object); // Remove object
+	lua_remove(L, errorhandler); // Remove error handler
 }
 
diff --git a/src/script/cpp_api/s_inventory.cpp b/src/script/cpp_api/s_inventory.cpp
index 09f26d80c..4ee6e4be0 100644
--- a/src/script/cpp_api/s_inventory.cpp
+++ b/src/script/cpp_api/s_inventory.cpp
@@ -33,6 +33,9 @@ int ScriptApiDetached::detached_inventory_AllowMove(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "allow_move"))
 		return count;
@@ -42,23 +45,19 @@ int ScriptApiDetached::detached_inventory_AllowMove(
 	InventoryLocation loc;
 	loc.setDetached(name);
 	InvRef::create(L, loc);
-	// from_list
-	lua_pushstring(L, from_list.c_str());
-	// from_index
-	lua_pushinteger(L, from_index + 1);
-	// to_list
-	lua_pushstring(L, to_list.c_str());
-	// to_index
-	lua_pushinteger(L, to_index + 1);
-	// count
-	lua_pushinteger(L, count);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 7, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	lua_pushstring(L, from_list.c_str()); // from_list
+	lua_pushinteger(L, from_index + 1);   // from_index
+	lua_pushstring(L, to_list.c_str());   // to_list
+	lua_pushinteger(L, to_index + 1);     // to_index
+	lua_pushinteger(L, count);            // count
+	objectrefGetOrCreate(player);         // player
+	if(lua_pcall(L, 7, 1, errorhandler))
+		scriptError();
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_move should return a number");
-	return luaL_checkinteger(L, -1);
+	int ret = luaL_checkinteger(L, -1);
+	lua_pop(L, 2); // Pop integer and error handler
+	return ret;
 }
 
 // Return number of accepted items to be put
@@ -69,28 +68,28 @@ int ScriptApiDetached::detached_inventory_AllowPut(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "allow_put"))
 		return stack.count; // All will be accepted
 
 	// Call function(inv, listname, index, stack, player)
-	// inv
 	InventoryLocation loc;
 	loc.setDetached(name);
-	InvRef::create(L, loc);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	InvRef::create(L, loc);              // inv
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 1, errorhandler))
+		scriptError();
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_put should return a number");
-	return luaL_checkinteger(L, -1);
+	int ret = luaL_checkinteger(L, -1);
+	lua_pop(L, 2); // Pop integer and error handler
+	return ret;
 }
 
 // Return number of accepted items to be taken
@@ -101,28 +100,28 @@ int ScriptApiDetached::detached_inventory_AllowTake(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "allow_take"))
 		return stack.count; // All will be accepted
 
 	// Call function(inv, listname, index, stack, player)
-	// inv
 	InventoryLocation loc;
 	loc.setDetached(name);
-	InvRef::create(L, loc);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	InvRef::create(L, loc);              // inv
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 1, errorhandler))
+		scriptError();
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_take should return a number");
-	return luaL_checkinteger(L, -1);
+	int ret = luaL_checkinteger(L, -1);
+	lua_pop(L, 2); // Pop integer and error handler
+	return ret;
 }
 
 // Report moved items
@@ -134,6 +133,9 @@ void ScriptApiDetached::detached_inventory_OnMove(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "on_move"))
 		return;
@@ -143,20 +145,15 @@ void ScriptApiDetached::detached_inventory_OnMove(
 	InventoryLocation loc;
 	loc.setDetached(name);
 	InvRef::create(L, loc);
-	// from_list
-	lua_pushstring(L, from_list.c_str());
-	// from_index
-	lua_pushinteger(L, from_index + 1);
-	// to_list
-	lua_pushstring(L, to_list.c_str());
-	// to_index
-	lua_pushinteger(L, to_index + 1);
-	// count
-	lua_pushinteger(L, count);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 7, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	lua_pushstring(L, from_list.c_str()); // from_list
+	lua_pushinteger(L, from_index + 1);   // from_index
+	lua_pushstring(L, to_list.c_str());   // to_list
+	lua_pushinteger(L, to_index + 1);     // to_index
+	lua_pushinteger(L, count);            // count
+	objectrefGetOrCreate(player);         // player
+	if(lua_pcall(L, 7, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 // Report put items
@@ -167,6 +164,9 @@ void ScriptApiDetached::detached_inventory_OnPut(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "on_put"))
 		return;
@@ -176,16 +176,13 @@ void ScriptApiDetached::detached_inventory_OnPut(
 	InventoryLocation loc;
 	loc.setDetached(name);
 	InvRef::create(L, loc);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 // Report taken items
@@ -196,6 +193,9 @@ void ScriptApiDetached::detached_inventory_OnTake(
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getDetachedInventoryCallback(name, "on_take"))
 		return;
@@ -205,16 +205,13 @@ void ScriptApiDetached::detached_inventory_OnTake(
 	InventoryLocation loc;
 	loc.setDetached(name);
 	InvRef::create(L, loc);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 // Retrieves minetest.detached_inventories[name][callbackname]
diff --git a/src/script/cpp_api/s_item.cpp b/src/script/cpp_api/s_item.cpp
index 1d5f218cf..49729e57b 100644
--- a/src/script/cpp_api/s_item.cpp
+++ b/src/script/cpp_api/s_item.cpp
@@ -34,6 +34,9 @@ bool ScriptApiItem::item_OnDrop(ItemStack &item,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getItemCallback(item.name.c_str(), "on_drop"))
 		return false;
@@ -42,10 +45,11 @@ bool ScriptApiItem::item_OnDrop(ItemStack &item,
 	LuaItemStack::create(L, item);
 	objectrefGetOrCreate(dropper);
 	pushFloatPos(L, pos);
-	if(lua_pcall(L, 3, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 3, 1, errorhandler))
+		scriptError();
 	if(!lua_isnil(L, -1))
 		item = read_item(L,-1, getServer());
+	lua_pop(L, 2);  // Pop item and error handler
 	return true;
 }
 
@@ -54,6 +58,9 @@ bool ScriptApiItem::item_OnPlace(ItemStack &item,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getItemCallback(item.name.c_str(), "on_place"))
 		return false;
@@ -62,10 +69,11 @@ bool ScriptApiItem::item_OnPlace(ItemStack &item,
 	LuaItemStack::create(L, item);
 	objectrefGetOrCreate(placer);
 	pushPointedThing(pointed);
-	if(lua_pcall(L, 3, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 3, 1, errorhandler))
+		scriptError();
 	if(!lua_isnil(L, -1))
 		item = read_item(L,-1, getServer());
+	lua_pop(L, 2);  // Pop item and error handler
 	return true;
 }
 
@@ -74,6 +82,9 @@ bool ScriptApiItem::item_OnUse(ItemStack &item,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Push callback function on stack
 	if(!getItemCallback(item.name.c_str(), "on_use"))
 		return false;
@@ -82,10 +93,11 @@ bool ScriptApiItem::item_OnUse(ItemStack &item,
 	LuaItemStack::create(L, item);
 	objectrefGetOrCreate(user);
 	pushPointedThing(pointed);
-	if(lua_pcall(L, 3, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 3, 1, errorhandler))
+		scriptError();
 	if(!lua_isnil(L, -1))
 		item = read_item(L,-1, getServer());
+	lua_pop(L, 2);  // Pop item and error handler
 	return true;
 }
 
@@ -94,6 +106,9 @@ bool ScriptApiItem::item_OnCraft(ItemStack &item, ServerActiveObject *user,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	lua_getglobal(L, "minetest");
 	lua_getfield(L, -1, "on_craft");
 	LuaItemStack::create(L, item);
@@ -106,10 +121,11 @@ bool ScriptApiItem::item_OnCraft(ItemStack &item, ServerActiveObject *user,
 	push_items(L, items);
 
 	InvRef::create(L, craft_inv);
-	if(lua_pcall(L, 4, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 4, 1, errorhandler))
+		scriptError();
 	if(!lua_isnil(L, -1))
 		item = read_item(L,-1, getServer());
+	lua_pop(L, 2);  // Pop item and error handler
 	return true;
 }
 
@@ -118,11 +134,14 @@ bool ScriptApiItem::item_CraftPredict(ItemStack &item, ServerActiveObject *user,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	lua_getglobal(L, "minetest");
 	lua_getfield(L, -1, "craft_predict");
 	LuaItemStack::create(L, item);
 	objectrefGetOrCreate(user);
-	
+
 	//Push inventory list
 	std::vector<ItemStack> items;
 	for(u32 i=0; i<old_craft_grid->getSize(); i++)
@@ -130,10 +149,11 @@ bool ScriptApiItem::item_CraftPredict(ItemStack &item, ServerActiveObject *user,
 	push_items(L, items);
 
 	InvRef::create(L, craft_inv);
-	if(lua_pcall(L, 4, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 4, 1, errorhandler))
+		scriptError();
 	if(!lua_isnil(L, -1))
 		item = read_item(L,-1, getServer());
+	lua_pop(L, 2);  // Pop item and error handler
 	return true;
 }
 
@@ -149,15 +169,15 @@ bool ScriptApiItem::getItemCallback(const char *name, const char *callbackname)
 
 	lua_getglobal(L, "minetest");
 	lua_getfield(L, -1, "registered_items");
-	lua_remove(L, -2);
+	lua_remove(L, -2); // Remove minetest
 	luaL_checktype(L, -1, LUA_TTABLE);
 	lua_getfield(L, -1, name);
-	lua_remove(L, -2);
+	lua_remove(L, -2); // Remove registered_items
 	// Should be a table
 	if(lua_type(L, -1) != LUA_TTABLE)
 	{
 		// Report error and clean up
-		errorstream<<"Item \""<<name<<"\" not defined"<<std::endl;
+		errorstream << "Item \"" << name << "\" not defined" << std::endl;
 		lua_pop(L, 1);
 
 		// Try minetest.nodedef_default instead
@@ -167,24 +187,16 @@ bool ScriptApiItem::getItemCallback(const char *name, const char *callbackname)
 		luaL_checktype(L, -1, LUA_TTABLE);
 	}
 	lua_getfield(L, -1, callbackname);
-	lua_remove(L, -2);
+	lua_remove(L, -2); // Remove item def
 	// Should be a function or nil
-	if(lua_type(L, -1) == LUA_TFUNCTION)
-	{
+	if (lua_type(L, -1) == LUA_TFUNCTION) {
 		return true;
+	} else if (!lua_isnil(L, -1)) {
+		errorstream << "Item \"" << name << "\" callback \""
+			<< callbackname << "\" is not a function" << std::endl;
 	}
-	else if(lua_isnil(L, -1))
-	{
-		lua_pop(L, 1);
-		return false;
-	}
-	else
-	{
-		errorstream<<"Item \""<<name<<"\" callback \""
-			<<callbackname<<" is not a function"<<std::endl;
-		lua_pop(L, 1);
-		return false;
-	}
+	lua_pop(L, 1);
+	return false;
 }
 
 void ScriptApiItem::pushPointedThing(const PointedThing& pointed)
diff --git a/src/script/cpp_api/s_mainmenu.cpp b/src/script/cpp_api/s_mainmenu.cpp
index af92c59a9..5c54f7368 100644
--- a/src/script/cpp_api/s_mainmenu.cpp
+++ b/src/script/cpp_api/s_mainmenu.cpp
@@ -37,29 +37,41 @@ void ScriptApiMainMenu::handleMainMenuEvent(std::string text)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Get handler function
 	lua_getglobal(L, "engine");
 	lua_getfield(L, -1, "event_handler");
-	if(lua_isnil(L, -1))
+	lua_remove(L, -2); // Remove engine
+	if(lua_isnil(L, -1)) {
+		lua_pop(L, 1); // Pop event_handler
 		return;
+	}
 	luaL_checktype(L, -1, LUA_TFUNCTION);
 
 	// Call it
 	lua_pushstring(L, text.c_str());
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error running function engine.event_handler: %s\n",
-				lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 void ScriptApiMainMenu::handleMainMenuButtons(std::map<std::string, std::string> fields)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	// Get handler function
 	lua_getglobal(L, "engine");
 	lua_getfield(L, -1, "button_handler");
-	if(lua_isnil(L, -1))
+	lua_remove(L, -2); // Remove engine
+	if(lua_isnil(L, -1)) {
+		lua_pop(L, 1); // Pop button handler
 		return;
+	}
 	luaL_checktype(L, -1, LUA_TFUNCTION);
 
 	// Convert fields to lua table
@@ -74,7 +86,7 @@ void ScriptApiMainMenu::handleMainMenuButtons(std::map<std::string, std::string>
 	}
 
 	// Call it
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error running function engine.button_handler: %s\n",
-				lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
diff --git a/src/script/cpp_api/s_node.cpp b/src/script/cpp_api/s_node.cpp
index 92fd00a74..cd8451cf0 100644
--- a/src/script/cpp_api/s_node.cpp
+++ b/src/script/cpp_api/s_node.cpp
@@ -91,6 +91,9 @@ bool ScriptApiNode::node_on_punch(v3s16 p, MapNode node,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -101,8 +104,9 @@ bool ScriptApiNode::node_on_punch(v3s16 p, MapNode node,
 	push_v3s16(L, p);
 	pushnode(L, node, ndef);
 	objectrefGetOrCreate(puncher);
-	if(lua_pcall(L, 3, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 3, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 	return true;
 }
 
@@ -111,6 +115,9 @@ bool ScriptApiNode::node_on_dig(v3s16 p, MapNode node,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -121,8 +128,9 @@ bool ScriptApiNode::node_on_dig(v3s16 p, MapNode node,
 	push_v3s16(L, p);
 	pushnode(L, node, ndef);
 	objectrefGetOrCreate(digger);
-	if(lua_pcall(L, 3, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 3, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 	return true;
 }
 
@@ -130,6 +138,9 @@ void ScriptApiNode::node_on_construct(v3s16 p, MapNode node)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -138,14 +149,18 @@ void ScriptApiNode::node_on_construct(v3s16 p, MapNode node)
 
 	// Call function
 	push_v3s16(L, p);
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 void ScriptApiNode::node_on_destruct(v3s16 p, MapNode node)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -154,14 +169,18 @@ void ScriptApiNode::node_on_destruct(v3s16 p, MapNode node)
 
 	// Call function
 	push_v3s16(L, p);
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 void ScriptApiNode::node_after_destruct(v3s16 p, MapNode node)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -171,14 +190,18 @@ void ScriptApiNode::node_after_destruct(v3s16 p, MapNode node)
 	// Call function
 	push_v3s16(L, p);
 	pushnode(L, node, ndef);
-	if(lua_pcall(L, 2, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 2, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 bool ScriptApiNode::node_on_timer(v3s16 p, MapNode node, f32 dtime)
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// Push callback function on stack
@@ -188,12 +211,10 @@ bool ScriptApiNode::node_on_timer(v3s16 p, MapNode node, f32 dtime)
 	// Call function
 	push_v3s16(L, p);
 	lua_pushnumber(L,dtime);
-	if(lua_pcall(L, 2, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
-	if((bool)lua_isboolean(L,-1) && (bool)lua_toboolean(L,-1) == true)
-		return true;
-
-	return false;
+	if(lua_pcall(L, 2, 1, errorhandler))
+		scriptError();
+	lua_remove(L, errorhandler); // Remove error handler
+	return (bool) lua_isboolean(L, -1) && (bool) lua_toboolean(L, -1) == true;
 }
 
 void ScriptApiNode::node_on_receive_fields(v3s16 p,
@@ -203,6 +224,9 @@ void ScriptApiNode::node_on_receive_fields(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -215,12 +239,9 @@ void ScriptApiNode::node_on_receive_fields(v3s16 p,
 		return;
 
 	// Call function
-	// param 1
-	push_v3s16(L, p);
-	// param 2
-	lua_pushstring(L, formname.c_str());
-	// param 3
-	lua_newtable(L);
+	push_v3s16(L, p);                    // pos
+	lua_pushstring(L, formname.c_str()); // formname
+	lua_newtable(L);                     // fields
 	for(std::map<std::string, std::string>::const_iterator
 			i = fields.begin(); i != fields.end(); i++){
 		const std::string &name = i->first;
@@ -229,26 +250,37 @@ void ScriptApiNode::node_on_receive_fields(v3s16 p,
 		lua_pushlstring(L, value.c_str(), value.size());
 		lua_settable(L, -3);
 	}
-	// param 4
-	objectrefGetOrCreate(sender);
-	if(lua_pcall(L, 4, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	objectrefGetOrCreate(sender);        // player
+	if(lua_pcall(L, 4, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 void ScriptApiNode::node_falling_update(v3s16 p)
 {
 	SCRIPTAPI_PRECHECKHEADER
+
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	lua_getglobal(L, "nodeupdate");
 	push_v3s16(L, p);
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 void ScriptApiNode::node_falling_update_single(v3s16 p)
 {
 	SCRIPTAPI_PRECHECKHEADER
+
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	lua_getglobal(L, "nodeupdate_single");
 	push_v3s16(L, p);
-	if(lua_pcall(L, 1, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
+
diff --git a/src/script/cpp_api/s_nodemeta.cpp b/src/script/cpp_api/s_nodemeta.cpp
index e87464c61..1f04383f1 100644
--- a/src/script/cpp_api/s_nodemeta.cpp
+++ b/src/script/cpp_api/s_nodemeta.cpp
@@ -34,6 +34,9 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowMove(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -47,25 +50,21 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowMove(v3s16 p,
 		return count;
 
 	// function(pos, from_list, from_index, to_list, to_index, count, player)
-	// pos
-	push_v3s16(L, p);
-	// from_list
-	lua_pushstring(L, from_list.c_str());
-	// from_index
-	lua_pushinteger(L, from_index + 1);
-	// to_list
-	lua_pushstring(L, to_list.c_str());
-	// to_index
-	lua_pushinteger(L, to_index + 1);
-	// count
-	lua_pushinteger(L, count);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 7, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                     // pos
+	lua_pushstring(L, from_list.c_str()); // from_list
+	lua_pushinteger(L, from_index + 1);   // from_index
+	lua_pushstring(L, to_list.c_str());   // to_list
+	lua_pushinteger(L, to_index + 1);     // to_index
+	lua_pushinteger(L, count);            // count
+	objectrefGetOrCreate(player);         // player
+	if(lua_pcall(L, 7, 1, errorhandler))
+		scriptError();
+	lua_remove(L, errorhandler); // Remove error handler
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_metadata_inventory_move should return a number");
-	return luaL_checkinteger(L, -1);
+	int num = luaL_checkinteger(L, -1);
+	lua_pop(L, 1); // Pop integer
+	return num;
 }
 
 // Return number of accepted items to be put
@@ -75,6 +74,9 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowPut(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -88,21 +90,19 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowPut(v3s16 p,
 		return stack.count;
 
 	// Call function(pos, listname, index, stack, player)
-	// pos
-	push_v3s16(L, p);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                    // pos
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 1, errorhandler))
+		scriptError();
+	lua_remove(L, errorhandler); // Remove error handler
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_metadata_inventory_put should return a number");
-	return luaL_checkinteger(L, -1);
+	int num = luaL_checkinteger(L, -1);
+	lua_pop(L, 1); // Pop integer
+	return num;
 }
 
 // Return number of accepted items to be taken
@@ -112,6 +112,9 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowTake(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -125,21 +128,19 @@ int ScriptApiNodemeta::nodemeta_inventory_AllowTake(v3s16 p,
 		return stack.count;
 
 	// Call function(pos, listname, index, count, player)
-	// pos
-	push_v3s16(L, p);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                    // pos
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 1, errorhandler))
+		scriptError();
+	lua_remove(L, errorhandler); // Remove error handler
 	if(!lua_isnumber(L, -1))
 		throw LuaError(L, "allow_metadata_inventory_take should return a number");
-	return luaL_checkinteger(L, -1);
+	int num = luaL_checkinteger(L, -1);
+	lua_pop(L, 1); // Pop integer
+	return num;
 }
 
 // Report moved items
@@ -150,6 +151,9 @@ void ScriptApiNodemeta::nodemeta_inventory_OnMove(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -163,22 +167,16 @@ void ScriptApiNodemeta::nodemeta_inventory_OnMove(v3s16 p,
 		return;
 
 	// function(pos, from_list, from_index, to_list, to_index, count, player)
-	// pos
-	push_v3s16(L, p);
-	// from_list
-	lua_pushstring(L, from_list.c_str());
-	// from_index
-	lua_pushinteger(L, from_index + 1);
-	// to_list
-	lua_pushstring(L, to_list.c_str());
-	// to_index
-	lua_pushinteger(L, to_index + 1);
-	// count
-	lua_pushinteger(L, count);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 7, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                     // pos
+	lua_pushstring(L, from_list.c_str()); // from_list
+	lua_pushinteger(L, from_index + 1);   // from_index
+	lua_pushstring(L, to_list.c_str());   // to_list
+	lua_pushinteger(L, to_index + 1);     // to_index
+	lua_pushinteger(L, count);            // count
+	objectrefGetOrCreate(player);         // player
+	if(lua_pcall(L, 7, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 // Report put items
@@ -188,6 +186,9 @@ void ScriptApiNodemeta::nodemeta_inventory_OnPut(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -201,18 +202,14 @@ void ScriptApiNodemeta::nodemeta_inventory_OnPut(v3s16 p,
 		return;
 
 	// Call function(pos, listname, index, stack, player)
-	// pos
-	push_v3s16(L, p);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                    // pos
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 // Report taken items
@@ -222,6 +219,9 @@ void ScriptApiNodemeta::nodemeta_inventory_OnTake(v3s16 p,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	INodeDefManager *ndef = getServer()->ndef();
 
 	// If node doesn't exist, we don't know what callback to call
@@ -235,18 +235,14 @@ void ScriptApiNodemeta::nodemeta_inventory_OnTake(v3s16 p,
 		return;
 
 	// Call function(pos, listname, index, stack, player)
-	// pos
-	push_v3s16(L, p);
-	// listname
-	lua_pushstring(L, listname.c_str());
-	// index
-	lua_pushinteger(L, index + 1);
-	// stack
-	LuaItemStack::create(L, stack);
-	// player
-	objectrefGetOrCreate(player);
-	if(lua_pcall(L, 5, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	push_v3s16(L, p);                    // pos
+	lua_pushstring(L, listname.c_str()); // listname
+	lua_pushinteger(L, index + 1);       // index
+	LuaItemStack::create(L, stack);      // stack
+	objectrefGetOrCreate(player);        // player
+	if(lua_pcall(L, 5, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 ScriptApiNodemeta::ScriptApiNodemeta() {
diff --git a/src/script/cpp_api/s_server.cpp b/src/script/cpp_api/s_server.cpp
index d41805b7b..4baf90636 100644
--- a/src/script/cpp_api/s_server.cpp
+++ b/src/script/cpp_api/s_server.cpp
@@ -27,13 +27,18 @@ bool ScriptApiServer::getAuth(const std::string &playername,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	getAuthHandler();
 	lua_getfield(L, -1, "get_auth");
 	if(lua_type(L, -1) != LUA_TFUNCTION)
 		throw LuaError(L, "Authentication handler missing get_auth");
 	lua_pushstring(L, playername.c_str());
-	if(lua_pcall(L, 1, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 1, 1, errorhandler))
+		scriptError();
+	lua_remove(L, -2); // Remove auth handler
+	lua_remove(L, errorhandler); // Remove error handler
 
 	// nil = login not allowed
 	if(lua_isnil(L, -1))
@@ -49,8 +54,7 @@ bool ScriptApiServer::getAuth(const std::string &playername,
 
 	lua_getfield(L, -1, "privileges");
 	if(!lua_istable(L, -1))
-		throw LuaError(L,
-				"Authentication handler didn't return privilege table");
+		throw LuaError(L, "Authentication handler didn't return privilege table");
 	if(dst_privs)
 		readPrivileges(-1, *dst_privs);
 	lua_pop(L, 1);
@@ -68,6 +72,7 @@ void ScriptApiServer::getAuthHandler()
 		lua_pop(L, 1);
 		lua_getfield(L, -1, "builtin_auth_handler");
 	}
+	lua_remove(L, -2); // Remove minetest
 	if(lua_type(L, -1) != LUA_TTABLE)
 		throw LuaError(L, "Authentication handler table not valid");
 }
@@ -96,14 +101,19 @@ void ScriptApiServer::createAuth(const std::string &playername,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	getAuthHandler();
 	lua_getfield(L, -1, "create_auth");
+	lua_remove(L, -2); // Remove auth handler
 	if(lua_type(L, -1) != LUA_TFUNCTION)
 		throw LuaError(L, "Authentication handler missing create_auth");
 	lua_pushstring(L, playername.c_str());
 	lua_pushstring(L, password.c_str());
-	if(lua_pcall(L, 2, 0, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 2, 0, errorhandler))
+		scriptError();
+	lua_pop(L, 1); // Pop error handler
 }
 
 bool ScriptApiServer::setPassword(const std::string &playername,
@@ -111,14 +121,19 @@ bool ScriptApiServer::setPassword(const std::string &playername,
 {
 	SCRIPTAPI_PRECHECKHEADER
 
+	lua_pushcfunction(L, script_error_handler);
+	int errorhandler = lua_gettop(L);
+
 	getAuthHandler();
 	lua_getfield(L, -1, "set_password");
+	lua_remove(L, -2); // Remove auth handler
 	if(lua_type(L, -1) != LUA_TFUNCTION)
 		throw LuaError(L, "Authentication handler missing set_password");
 	lua_pushstring(L, playername.c_str());
 	lua_pushstring(L, password.c_str());
-	if(lua_pcall(L, 2, 1, 0))
-		scriptError("error: %s", lua_tostring(L, -1));
+	if(lua_pcall(L, 2, 1, errorhandler))
+		scriptError();
+	lua_remove(L, -2); // Remove error handler
 	return lua_toboolean(L, -1);
 }