FB SDK produces a PHP Fatal error

Question

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. T

Answer 1

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);