Named actors crash game?

Having a serious problem here; if any actor other than actor 1 has a name, the game will always crash if the character learned skills during battle, making it impossible to have a game with more than one actor. It isn't related to Yanfly's scripts (I've checked) and the only thing I edited before the glitch started was common events. Actually, it started when I got an identical error when visiting the items menu, and I've been getting a lot of these recently, suggesting that my game might actually be corrupted.
Alternatively, I ran a few tests, and it could be the monster collapse script that's the problem.

EDIT: ran a few tests, apparently Minto's Monster Collapse doesn't like named actors other than actor 1 levelling up.

The script wasn't thoroughly tested I believe. To me, it seems to have randomly decided to become incompatible with levelling up named actors.

I got an identical error when visiting the items menu, and I've been getting a lot of these recently, suggesting that my game might actually be corrupted.