Crashing when trying to go to the Mudcrab Merchant

Hi.

Recently, whenever I try to visit the mudcrab merchant, the game crashes. There is a lot of distortion coming from the mudcrab. This is something that has happened in the past, but until now hasn't been a problem. The issue now is that I'm pretty sure that I sold my copy of Divine Metaphysics to him and I need to get it back now for the mages' guild quest. The problem is, if I try to approach him, the game crashes. Any ideas as to how I can fix the mudcrab merchant?

Have you tried a Save Before

Have you tried a Save Before you went There.Back 2 Save and Play through again

Yes, I did. The merchant is

Yes, I did. The merchant is still corrupted. I tried approaching it from a different angle and was able to talk to him, but now the corruption seems to have spread again.

Anyway, after checking with several merchants, I tried adding Divine Metaphysics using the console, but it says the ObjectID can't be found. Any idea if what the objectID is?