Crash when closing project window

The app crashes on what appears to be a closing of a project/repository window while there's a diff going on.

In my case, I have a repo that has a binary library that keeps getting changed by the build process. It's the only change in the working copy.

Open the repo's window, and that changed library is selected, and on the right side of the window the detail of the change is automatically being displayed... and there are spinners showing the diff in progress.

If I wait until the diff completes (no more spinners), I can close the window no problem. If however I close the window while things are spinning, it crashes.

It reproduces this way every time for me.

Crash log attached.