--- phase3.orig/trackback.php	Mon Sep  4 21:07:24 2006
+++ phase3/trackback.php	Fri Sep  8 13:31:05 2006
@@ -50,7 +50,7 @@
 $tbarticle = $_REQUEST['article'];
 
 $title = Title::newFromText($tbarticle);
-if (!$title->exists())
+if ($title == null || !$title->exists())
 	XMLerror("Specified article does not exist.");
 
 $dbw->insert('trackbacks', array(