diff --git a/mail/inc/class.mail_hooks.inc.php b/mail/inc/class.mail_hooks.inc.php
index 88860f6f89..943f66d152 100644
--- a/mail/inc/class.mail_hooks.inc.php
+++ b/mail/inc/class.mail_hooks.inc.php
@@ -446,6 +446,7 @@ class mail_hooks
 		{
 			foreach ($menu['items'] as &$item)
 			{
+				if (!is_array($item)) continue;
 				if (array_key_exists('enable', $item) && !$item['enable']) {
 					unset($item);
 				}