[[NSUserDefaults standardUserDefaults] setObject:selectedLists forKey:UserID]

{
        CardFace = Word;
        ImportFlag = Import;
        ListID = 1;
        ListName = "Adjectives - Condition";
        QuizBy = Definition;
        UserID = 1;
}

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0x797714d0'