EXC_BAD_ACCESS on NSManagedObjectContext save method inside NSOperation and ARC, why?

Question

I have found some problems when saving NSManagedObjectContext inside NSOperation with turned on ARC. Without ARC everything was fine before. It is always gives EXC_BAD_ACCES

Answer 1

Maybe ARC deallocates some object that receives NSManagedObjectContextDidSaveNotification and this causes the exception? I had something similar, and fixed it by making sure to removeObserver: before the object gets deallocated.

Note that the CoreData exception actually hides the notification center exception, so you don't get to see it.