Fix undeclared globals warnings (#176)

Reported by Vanessa Dannenberg

1 files changed, 6 insertions, 3 deletions

diff --git a/advtrains/trainlogic.lua b/advtrains/trainlogic.lua
index c9c7e76..c812ff7 100644
--- a/advtrains/trainlogic.lua
+++ b/advtrains/trainlogic.lua
@@ -139,9 +139,12 @@ minetest.register_on_joinplayer(function(player)
 		advtrains.hhud[player:get_player_name()] = nil
 		--independent of this, cause all wagons of the train which are loaded to reattach their players
 		--needed because already loaded wagons won't call reattach_all()
-		for _,wagon in pairs(minetest.luaentities) do
-			if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
-				wagon:reattach_all()
+		local id=advtrains.player_to_train_mapping[pname]
+		if id then
+			for _,wagon in pairs(minetest.luaentities) do
+				if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
+					wagon:reattach_all()
+				end
 			end
 		end
 end)