[2.0.60] Crash closing unsaved ship interrupts (ScheduleGui:operator)

[sgoeg]

What did you do?
- Go to any ship
- Create or edit any interrupt
- Make any change to the interrupt, do not save changes
- Click outside the interrupt window, this should prompt you for unsaved changes
- If you press E (or the hotkey for confirm) once, the interrupt window closes, but the prompt for unsaved changes will still be there
- If you press E again, the game crashes

What happened?
Game crashed

What did you expect to happen instead? It might be obvious to you, but do it anyway!
Game should not crash

Does it happen always, once, or sometimes?
Always

Logs are attached.

My savefile in case you need it:
https://drive.google.com/file/d/1cCH3FJ ... sp=sharing