Spine crashes when selecting a bone. I was able to repro this on two different Spine characters. One character had roughly 9 bones, the other had around 20. I can get this to occur within seconds if I'm trying to reproduce it.

Repro steps:

1. Open up a Spine character.
2. Click on different bones continuously.

Note: Doesn't matter if you are in Setup or Animation mode

Expected Results:
Clicked bone gets selected

Actual Results:
Spine crashes