ios – Core Data未将NSManagedObject实例的错误作为app delegate上的属性触发

我将登录用户的数据从服务器导入名为“用户”的核心数据实体.我还将这个特定用户对象的引用保存到我的AppDelegate(作为属性),以便我可以在我的应用程序的其他位置访问它.我面临的问题是,当我推送另一个视图控制器并尝试访问appdelegate.loggedInUser.id时,我看到“id”为零.调试器为对象显示以下内容：

$24 = 0x0b28ad30 <User: 0xb28ad30> (entity: User; id: 0xb261160 <x-coredata:///User/tC48E8991-B8A6-4E68-9112-93F9F21DB5382> ; data: <fault>)

我的理解是,当我尝试访问此对象的某个属性时,Core Data框架将触发错误.我很困惑为什么我在这种情况下访问用户的“id”属性没有触发错误？

编辑：

这是创建和使用loggedInUser对象的方法：

//method to get bgContext 
+(NsmanagedObjectContext *)getContextOnBgWithParentSetToMainMOC
{
  NsmanagedObjectContext *tmpContext = [[NsmanagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
  [tmpContext setParentContext:[Utils getAppDelegate].managedObjectContext];
  return tmpContext;
}

//in App Delegate
NsmanagedObjectContext *bgContext = [NsmanagedObjectContext getContextOnBgWithParentSetToMainMOC];
   self.loggedInUser = [User importFromObject:loggedInUserData inContext:bgContext completionBlock:^(NsmanagedObjectContext *theContext,NsmanagedObject *theManagedObjectWithValuesImported) {}];

//In User.m file
+ (User *)importFromObject:(NSDictionary *)Dictionary inContext:(NsmanagedObjectContext *)context completionBlock:(TemporaryContextImportReturnBlock)block {

  if ( !context ){
    context = [NsmanagedObjectContext getContextOnBgWithParentSetToMainMOC];
  }

  NsmanagedObjectContext *localContext = context;
    User *newUserEntity = [NSEntityDescription insertNewObjectForEntityForName:@"User" inManagedObjectContext:localContext];
    NSArray *emailsArray = [Dictionary objectForKey:@"emails"];
    NSString *emailsString = @"";
    if ([emailsArray count] > 0){
      emailsString = [emailsArray componentsJoinedByString:@","];
    }
    newUserEntity.emails = emailsString;
    newUserEntity.id = [Dictionary objectForKey:@"id"];
    newUserEntity.n = [Dictionary nonNullObjectForKey:@"n"];
  return newUserEntity;
}

//Access in one of the view controllers
    User *loggedInUser = [Utils getAppDelegate].loggedInUser;
//    loggedInUser.id /*nil*/