Current `master` branch throws Uncaught (in promise) Error

When Popup.html is closed, the following error occurs in background.ts.
By the way, no error occurs when Popup.html is open.

<img width="676" height="81" alt="Image" src="https://github.com/user-attachments/assets/f8495d0b-df73-4958-93b1-07845ada78df" />