Try to fix crash

luaentity.lua

@@ -251,6 +251,10 @@ end
 -- end
 
 function luaentity.add_entity(pos, name)
+	if not luaentity.entities then
+		minetest.after(0, luaentity.add_entity, vector.new(pos), name)
+		return
+	end
 	local index = luaentity.entities_index
 	while luaentity.entities[index] do
 		index = index + 1