Below are some code snippet from my code base for better understanding. Fetch request for used for NSFetchedResultsController object: (NSFetchRequest *)fetchRequest { 		NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass([ABC class])]; 		request.predicate = [NSPredicate predicateWithFormat:@"id = %@ AND removed = NO", 												 [LMSAppDelegate sharedDelegate].module.cycleID]; 		request.returnsDistinctResults = YES; 		request.propertiesToFetch = @[@"xyz"]; 		request.resultType = NSDictionaryResultType; 		request.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"xyz" ascending:YES]]; 		return request; } Crashing code: (NSIndexPath *)indexPathForObject:(id)object { 		return [self.fetchedResultsController indexPathForObject:object]; }