Index: class-wp-admin-bar.php
===================================================================
--- class-wp-admin-bar.php	(revision 10)
+++ class-wp-admin-bar.php	(working copy)
@@ -192,7 +192,7 @@
 	function remove_node( $id, &$menu ) {
 		foreach( $menu as $menu_item_id => &$menu_item ) {
 			if ( $menu_item_id == $id ) {
-				$menu_item = null;
+				unset($menu->{$menu_item_id});
 				return true;
 			}