This isn't a BHAV tree part of AwesomeWare at all. This is some kind of stack corruption, possibly induced by patch-resets. Is it recurring, or is it a one-shot that clears up after the stack resets?
I'm not sure. I haven't continued to play a family after getting the error. When I got the error, I restored the neighborhood, since it was fresh from a backup. I had the same problem with several different families in several different neighborhoods, so I stopped playing and tried to figure out which hack was causing the problem. I reset the neighborhoods from my backup after each test; so it makes sense that this might be caused by a patch-reset. It only happens if I have marriage-postmortem installed. I can put marriage-postmortem back in and try playing each family longer, to see whether it recurs.
If the error clears up after a reset, is it likely to be OK? Or, can I expect other negative consequences?