around what point in the game is it happening?
Late first pregnancy, but the exact occurrence is random. Or at least I can't figure out the common factor.
After the patch, the first event I got after it would normally crash was the one asking how you feel about your growing pregnant body.
I seem to regularly get the error the next morning after that event, after waking up.
I FINALLY found the awful little typo causing the problem. I've played it through several times now with no error, you should be in the clear now.