Hi Robert,

I've managed to reproduce the bug. It's quite simple.
Open up a .zip file with multiple files in it , change the name of one of the files, and then press the red close button in the top left corner of the app and press save in the overlay window that appears.

Application will then crash.

This happens all the time, even with simple .zip archives made with betterzip with only 2 files (.jpg) in them.

If you need more information, please let me know!