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phpfbsdk

FB SDK produces a PHP Fatal error

First noticed [27-Mar-2017 17:47:16 GMT+0] a FB SDK integration that worked very well allowing people to login to our site via their Facebook account just stopped working. The server logs show the following error

PHP Fatal error:  Cannot use object of type stdClass as array in fb-sdk/FacebookRedirectLoginHelper.php on line 191

We have not done any relevant code change that should have initiated it. Have we missed an upgrade?

Solution

  • Suggested fix for line 191-193:

    if (isset($response->access_token)) {
return new FacebookSession($response->access_token);
}

    You can also try converting $response to array but that won't be optimized solution. So, go ahead and try aforementioned solution.

    Or try replacing in src/Facebook/FacebookRedirectLoginHelper.php

     if (isset($response['access_token'])) {
    return new FacebookSession($response['access_token']);

    WITH

      $accessToken = null;
  if (is_object($response) && isset($response->access_token)) {
    $accessToken = $response->access_token;
  } elseif (is_array($response) && isset($response['access_token'])) {
    $accessToken = $response['access_token'];
  }
  if (isset($accessToken)) {
    return new FacebookSession($accessToken);