Merge branch 'master' of https://github.com/google/google-api-php-client

Author: Ian Barber

src/Google/Auth/OAuth2.php

@@ -370,7 +370,7 @@ public function revokeToken($token = null)
    */
   public function isAccessTokenExpired()
   {
-    if (!$this->token) {
+    if (!$this->token || !isset($this->token['created'])) {
       return true;
     }