Crash on Creature Sheet

http://puu.sh/p7ePI/79a44aa5dd.png
(error log)

I got this error when I had hit the down key on my creature’s stat sheet after completing the tutorial battle.

Running on Windows 7.

Edit: Turns out this is specifically due to it trying to switch to the next creature in your party if you only have one creature. Doesn’t happen with 2.