Thanks for the report! I don't know what caused it, but you're the first person to do that, including the dev team, so I'll have to check it out.
Thanks, that's really helpful! Based on that error report, it may be that no-one has actually had all the children die since we released the "full" version of the game, lol. Perhaps the whole ending is broken.
EDIT: Ugh, looks like a recent update which enabled easy save-games causes a crash when converted using Pulpmill like this game is. I'll look into a fix.