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Editorial Team
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Asked: 2026-06-12T11:08:36+00:00

I am getting a message like below in the log when I am logging

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I am getting a message like below in the log when I am logging in via facebook

*** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<null>' of class 'NSNull'.  Note that dictionaries and arrays in property lists must also contain only property values.

What is its meaning?
Why this message is coming?

In facebook.m class I am setting like

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSNull null] forKey:@"FBAccessTokenKey"];
[defaults setObject:[NSNull null] forKey:@"FBExpirationDateKey"];
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1 Answer

  1. Editorial Team

    As NSUserDefaults serializes its data to a property list (/var/mobile/Library/Preferences/[BUNDLE_ID].plist), all set properties should be property list object, i. e. NSArray, NSDictionary, NSString, NSNumber, NSData or NSDate. If you want to remove a value of a key, use the - removeObjectForKey: message on NSUserDefaults.

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