diff --git a/lib/mega.class.php b/lib/mega.class.php
index 5b0fe49..a45018a 100644
--- a/lib/mega.class.php
+++ b/lib/mega.class.php
@@ -106,9 +106,9 @@ public static function create_from_session($session) {
    */
   public static function session_save($client) {
     return chunk_split(base64_encode(serialize(array(
-      'u_k' => $client->u_k,
-      'u_sid' => $client->u_sid,
-      'u_privk' => $client->u_privk,
+      'u_k' => $client[0],
+      'u_sid' => $client[1],
+      'u_privk' => $client[2],
     ))));
   }