[Sub-Issue] Fix bug that crashes game when you attempt to cancel a tween after it finishes

As said in the title, there is a bug that crashes the game when a tween stored in a variable is attempted to be cancelled after it finishes.

Error Message:

<img width="1046" height="371" alt="Image" src="https://github.com/user-attachments/assets/ad5ae894-ae93-465b-9d7f-7113d9b18690" />