Some players reported there's a crash in Beta when they hover cards when some machine finishes making food. It's fixed now, I hope. The crash only happens when in release version, in Godot editor or debug version it's not happened. The suspect is if we invoke Callable from an Object that has been recently freed, it will crash the game, and it's only happen in release version. So basically I add guard "if callable.is_valid():" before calling it. It seems fixed the crash.