Index: wp-admin/includes/post.php
===================================================================
--- wp-admin/includes/post.php	(revision 13890)
+++ wp-admin/includes/post.php	(working copy)
@@ -1205,8 +1205,7 @@
 
 	if ( !add_post_meta( $post->ID, '_edit_lock', $now, true ) )
 		update_post_meta( $post->ID, '_edit_lock', $now );
-	if ( !add_post_meta( $post->ID, '_edit_last', $current_user->ID, true ) )
-		update_post_meta( $post->ID, '_edit_last', $current_user->ID );
+	
 }
 
 /**