Sourcetree hangs when viewing specific commit

When choosing certain commits, sourcetree hangs for a long time (not sure how long, killed it after minutes). In the task manager I can see that sourcetree is using 50% cpu usage constantly, from the moment of hanging.
In de last 20 commits, I find 2 that I cannot view, because of hanging behaviour. It is reproducable, trying to view the same commits results in this behaviour.

It does not always generate logging, but I think in the attached logfile it has.

Additional findings:
resizing the sourcetree window makes viewing some commits not to crash sourcetree (maybe helpful to know?)