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-rw-r--r--builtin/misc.lua2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin/misc.lua b/builtin/misc.lua
index 1d5e146c6..f91f5e095 100644
--- a/builtin/misc.lua
+++ b/builtin/misc.lua
@@ -21,6 +21,8 @@ minetest.register_globalstep(function(dtime)
end)
function minetest.after(time, func, ...)
+ assert(tonumber(time) and type(func) == "function",
+ "Invalid minetest.after invocation")
table.insert(minetest.timers_to_add, {time=time, func=func, args={...}})
end