the parent class gets currently attached even if the submenu isn't configured to be shown. This breaks the menu on ipads, because the links with the parent class get rewritten to the void(0) function.

helper.patch

--- a/helper.php
+++ b/helper.php
@@ -149,7 +149,7 @@
                     $item->classe .= ' deeper';
                 }
 
-                if ($item->parent) {
+                if ($item->parent && $item->level != $end) {
                     if ($params->get('layout', 'default') != '_:flatlist' && $item->level != $end)
                         $item->classe .= ' parent';
                 }