fix

src/logic/scripting/lua/libcore.cpp

@@ -43,6 +43,7 @@ static int l_close_world(lua_State* L) {
     scripting::engine->setScreen(nullptr);
     // create and go to menu screen
     scripting::engine->setScreen(std::make_shared<MenuScreen>(scripting::engine));
+    return 0;
 }
 
 static int l_delete_world(lua_State* L) {

src/logic/scripting/scripting.cpp

@@ -32,6 +32,7 @@ Level* scripting::level = nullptr;
 const Content* scripting::content = nullptr;
 const ContentIndices* scripting::indices = nullptr;
 BlocksController* scripting::blocks = nullptr;
+LevelController* scripting::controller = nullptr;
 
 Environment::Environment(int env) : env(env) {
 }