I have had this crash-on-exit thing pretty consistently while playing 0.8.2 and 0.8.3. (0.8.2 was the first version I started playing.) Out of many dozens of times exiting the game, there might have been one or two times that it didn't crash on exit. (And before anyone asks: No, my recent reboot did not get rid of this crash-on-exit.)
I did not think much of it before because the crashes only happened when I was already exiting the game anyways, and the game never lost my progress as a result of them, so they seemed a non-issue. However, in light of the possiblity that something may be leaking resources on my box - resources this game needs to function correctly - it makes me wonder if this game might itself be leaking resources every time I run it (i.e., by not 100% successfully cleaning up after itself because it crashes before completing the cleanup work).