Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 23191)
+++ wp-admin/includes/template.php	(working copy)
@@ -677,7 +677,7 @@
 	$post = get_post();
 	$items = $wpdb->get_results( $wpdb->prepare("SELECT ID, post_parent, post_title FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' ORDER BY menu_order", $parent) );
 
-	if ( $items ) {
+	if ( $post && $items ) {
 		foreach ( $items as $item ) {
 			// A page cannot be its own parent.
 			if ( $post->ID && $item->ID == $post->ID )