diff --git a/libraries/Message.class.php b/libraries/Message.class.php
index e7947b854..9bf58470e 100644
--- a/libraries/Message.class.php
+++ b/libraries/Message.class.php
@@ -666,7 +666,7 @@ class PMA_Message
     static public function format()
     {
         $params = func_get_args();
-        if (is_array($params[1])) {
+        if (isset($params[1]) && is_array($params[1])) {
             array_unshift($params[1], $params[0]);
             $params = $params[1];
         }