My first thought was just to modify the level that the crash disappears, but I fear that it would just lead into another sporadic crash in another situation as it doesn't fix the issue itself.
I would advice you to create a blank new level, instead of the one that causes the crash after loading (just save this one somewhere, so it doesn't get changed/damaged). Then start putting everything from the older map into it one by one (yeah, it will take hell of the time, but probably will help you to track the crash down if it's related to something on that level).
Best regards!
