Ios NSUserDefaults在设置枚举对象时崩溃

因为我有一个像这样的枚举对象

typedef NS_ENUM(NSUInteger, AppState) {

AppStateNotEnabled,
AppStateLocationEnabledAndConnectedToInternet,
};
@property (nonatomic,assign) AppState appState;

我创建了enum对象，并在NSUserDefaults中设置了它的值

self.appState = AppStateLocationEnabledAndConnectedToInternet;
[[NSUserDefaults standardUserDefaults] setObject:@(self.appState) forKey:CURRENT_APP_STATE];

但它会像这样崩溃

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[6]' 

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我做错了什么请帮助

您确定这部分代码导致崩溃吗？崩溃是关于在数组中插入nil。你能分享你的崩溃跟踪吗？