We still have the bug ticket open from the Support ticket you filed a few months ago.
From my testing the crash only happens in a very specific circumstance: you have window.confirmBeforeClose set to always or keyboardOnly, and the ⌘+Q keys are still held down at the moment you confirm the quit dialog (e.g. pressing Enter / clicking Quit while Cmd is still pressed). That combination hits a code path that errors out instead of quitting. With the default setting, this path never runs, which is why most people don’t see it.
It’s something we should definitely fix. In the meantime, here are two workarounds that both avoid it:
Release ⌘+Q before pressing Enter / clicking Quit in the confirmation dialog, or
Remove the window.confirmBeforeClose setting (or set it back to never). You should still receive a dialog from Cursor asking if you’re sure you want to quit.