Ah dang... I did encounter this error once but it was less than an hour before the deadline. I did a quick check of the memory usage after it happened but I didn't see it increasing, it was hovering at an amount nowhere near the limit. So I don't know what causes the crash.
I read that the jam allows for bug fixes after submitting, so I'll look into it later. (idk if the rules still matter after the jam is over)