diff --git a/oc_api/OpenClassroomsAPI.php b/oc_api/OpenClassroomsAPI.php
index 40dfc3b8b168bbbec5ae82338440482d5b167b96..3c8927baa9991e964a9fc8aea6b4820a97219ee5 100644
--- a/oc_api/OpenClassroomsAPI.php
+++ b/oc_api/OpenClassroomsAPI.php
@@ -442,8 +442,8 @@ class OpenClassroomsAPI {
       $httpkeys_file = plugin_dir_path( __FILE__ ).'.httpkeys';
       if (is_file($httpkeys_file)) {
 	include($httpkeys_file);
-	if (!(isset(self::$httpkeys) && isset(self::$httpkeys['OAuth2/client_id']) && isset(self::$httpkeys['OAuth2/basic_auth']) && isset(self::$httpkeys['OAuth2/reditect_uri'])))
-	  self::reportLog("OpenClassroomsAPI::getAuth: Bad '.httpkeys' file format #".isset(self::$httpkeys)."-".isset(self::$httpkeys['OAuth2/client_id'])."-".isset(self::$httpkeys['OAuth2/basic_auth'])."-".isset(self::$httpkeys['OAuth2/reditect_uri']));
+	if (!(isset($httpkeys) && isset($httpkeys['OAuth2/client_id']) && isset($httpkeys['OAuth2/basic_auth']) && isset($httpkeys['OAuth2/reditect_uri'])))
+	  self::reportLog("OpenClassroomsAPI::getAuth: Bad '.httpkeys' file format #".isset($httpkeys)."-client_id:".isset($httpkeys['OAuth2/client_id'])."-basic_auth:".isset($httpkeys['OAuth2/basic_auth'])."-reditect_uri:".isset($httpkeys['OAuth2/reditect_uri']));
       } else {
 	self::reportLog("OpenClassroomsAPI::getAuth: Unable to read the '.httpkeys' file");
 	exit(0);