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I have some code that fetches entity model data in core-data, but when I built or debug in a simulator or phone the result will have Thread 39: EXC_BREAKPOINT (code=1, subcode=0x1afa582ec) and it is stopped at line 6 in the code bellow let context = self.managedObjectContext  let fetchRequest: NSFetchRequestSomeEntityModel = SomeEntityModel.fetchRequest()     fetchRequest.predicate = NSPredicate(format: "id=%@", "001")   let fetchResult = try context.fetch(fetchRequest) but, if I stop the debug, and run the app, not in the Xcode, the feature that develops those codes didn't stop, and it is running fine. Does anyone have a solution to why this happens?