I want to optimize Core Data and set the com.apple.CoreData.ConcurrencyDebug 1 flag. Now I get the exc_bad_instruction error for predicate. I didn't find enoght informations about it, only that can be the nil value, but I don't know how to fix it. 
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Ekta Padaliya
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If a `CDUser` is an `NSManagedObject` subclass then it means that you are accessing its properties not from it's MOC thread. – bteapot Dec 30 '15 at 09:51
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1I am experiencing the same error. Did you manage to solve this ? – Kong Hantrakool Jan 29 '16 at 11:25