Game crashes after editing a sim in cas.fulleditmode

So I just got Realm of Magic and it’s great. But when I go into cas.fulleditmode to edit a sim not in my household it crashes. My game really never crashes so this is new. It’s only when I go to save after I edit the sim does it crash. The screen goes black and exits the game. I’ve trued twice and it does it every time. Could it just be a bug in the new pack?