Game crash on attempted start

[JGelfand]

I played a bit on the $400 ship with one heavy slot, then bought a new ship and realized I should switch to mouse+kb to make handling multiple guns easier. I exited the game, then switched back and got the following error. The fancy new crash reporter prompted me to file an issue on github, so here we are.

[JGelfand]

Oh hey! I tried starting the game again, and got the same error. I guess I somehow broke my savefile. The "reached group size limit" thing makes me think it might have something to do with the way I maxed my bullets for my two heavy machine guns before exiting. I'll try and replicate this tomorrow, I guess. EDIT: Savefile here, if you're interested.
EDIT:I added a second savefile to the gist so you can test the crash: simply start a game with the second file, buy two bulletClips, and exit and attempt to relaunch.