[X] Once again, yet another strange error message.

Error Message: show
This might be level-specific, but in the level I'm working on right now, all of a sudden I keep getting this when going through a door and back. It basically crashes the game.
EDIT: It has nothing to do with doors. It keeps happening with a particular hitbox that is activating two trigger hitboxes at the same time, one of them having been activated before, but interrupted by going through a level splitter beforehand, and the other being the hitbox itself.
That is all I can comprehend at the moment.
EDIT2: Welp. I found the problem. I, accidentally, was "activating" the hitbox itself instead of "turning it off," which was my intention.
I think it may be self-explanatory now. (Take it as it's being activated right when it has already just been activated at the same time.)