SourceTree hangs on OSX on a regular basis

SourceTree hangs on OSX on a regular basis while on the main window (the repository list). It happens randomly but rather often, typically a few times a week and it's been happening since... well, since I started using it quite a while ago. I keep sending those reports using the system ForceQuit crash reporter but I'm not sure you're actually getting them from Apple

I don't know how to reproduce the issue as it seems to be random but if there's anything else I can do to help diagnose the bug please let me know.

System crash log attached.