Index: plugin.php
===================================================================
--- plugin.php	(revision 23695)
+++ plugin.php	(working copy)
@@ -1287,6 +1287,10 @@
 function remove_menu_page( $menu_slug ) {
 	global $menu;
 
+	if ( empty($menu) ) {
+		return false;
+	}
+
 	foreach ( $menu as $i => $item ) {
 		if ( $menu_slug == $item[2] ) {
 			unset( $menu[$i] );