Comment 11 for bug 1919025

The Edit TOC crashed when I select any paragraph and click OK.

I checked windows event viewer, and found 4 errors related to calibre-parallel.exe. Here I uploaded them:
https://drive.google.com/drive/folders/194vUn0iMt0Tlb_MjO9rYKZTr7l6KGwR-?usp=sharing

I also got some ideas that may or may not be useful:

BetterRed said in the Cliabre Forum: "Could it be something to do with this ==>> https://github.com/kovidgoyal/calibre/commit/b131d9226d56277174c0a5bb0783cea13c04864f"

Also, it seems from the errors that the related codes locate here:
https://github.com/kovidgoyal/calibre/blob/master/src/calibre/gui2/actions/toc_edit.py
https://github.com/kovidgoyal/calibre/blob/dc1437c2bbcabb2b67082b962538df2c74edb3f5/src/calibre/utils/lock.py#L85
I don't know much about Python, so having no idea what that implies.