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Editorial Team
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Asked: 2026-05-25T11:31:51+00:00

I recently integrated Facebook support into an iPhone application that I work on. I’m

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I recently integrated Facebook support into an iPhone application that I work on. I’m able to log the user in and make API calls fine, but I recently noticed some strange behavior.

After the user logs in I store the access token and the expiration date in NSUserDefaults. Before executing Facebook API calls I use [session isSessionValid] to make sure the session is valid.

The problem occurs if the user logs into Facebook from a desktop and then logs out. [session isSessionValid] still returns YES, but Facebook API calls fail with the error:

“Error validating access token: This may be because the user logged out or may be due to a system error.”

Is there anything that I am doing wrong, or is this a Facebook bug?

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1 Answer

  1. Editorial Team

    Even if you store the access token and the expiration date in NSUserDefaults, you need to validate them when the user enters your app each time, even offline_access permission access tokens might be invalidated for example when users change their password.

    When your app is started you just need to make a call to graph API “me” and in case you get exception you need simply to re-authorize, then you proceed with regular workflow of API calls.

    hope this helps

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