Index: menu_attributes.module
===================================================================
--- menu_attributes.module	(revision 23)
+++ menu_attributes.module	(working copy)
@@ -153,7 +153,7 @@
  * @see _menu_attributes_form_alter()
  */
 function menu_attributes_form_alter(&$form, $form_state, $form_id) {
-  if (isset($form['type']) && isset($form['#node']) && $form['type']['#value'] .'_node_form' == $form_id && isset($form['menu'])) {
+  if (isset($form['type']) && isset($form['#node']) && $form['type']['#value'] .'_node_form' == $form_id && $form['menu']['#access'] == TRUE) {
     $item = $form['#node']->menu;
     _menu_attributes_form_alter($form['menu'], $item);
     array_unshift($form['#submit'], 'menu_attributes_form_node_form_submit');