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    Could you add the code that create the objects and the crash? what is your context architecture (parent-child, merge, detached)? were the related objects on the main context deleted? Commented Nov 15, 2013 at 17:32
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    Please give a little more detail about how your code works. Specifically: (a) you have more than one managed object context-- are they related by a parent/child relationship? (b) When you save "again", how exactly are you doing this? Post relevant code. Commented Nov 15, 2013 at 17:32
  • @DanShelly I definitely would add the code that created the crash but it is sprinkled throughout the app - Numerous objects are crashing all over the place, in different view controllers and different methods! I will add the code the created the main objects - it is code that imports facebook friends on a background thread - creating a Person object for each facebook friend that is imported. It also creates other related objects - but the objects that it does NOT create are the ones that I am concerned about, when trying to access them causes this error. Commented Nov 15, 2013 at 18:02
  • @TomHarrington I did not intentionally create more than one managedObjectContext. I did it by importing on the wrong thread - the background thread - when EVERYTHING else I do in the app is on the main thread, and in the appdelegate moc. Commented Nov 15, 2013 at 18:13
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    "I did not intentionally create more than one managedObjectContext. I did it by importing on the wrong thread". That sentence makes no sense. Managed object contexts don't get created unless you create one. Using different threads does not automatically cause new contexts to exist. Commented Nov 15, 2013 at 18:16