I've crashed a couple more times recently when trying to undo things.
This time I haven't been working with multiple layers but i have been copy/pasting, moving, and drawing spline curves. I undid something after doing some combination of those things and it crashed. By the looks of the crashlog it seems to be some variant of the one from earlier...
http://pastebin.com/N5s8xk8q
And here's another one which I don't quite remember.
http://pastebin.com/kUfkmF7z