From f00d20a9db29bfda3d9854b0a5b8122848da9fd9 Mon Sep 17 00:00:00 2001
From: Rotem Liss <rotem@users.mediawiki.org>
Date: Sat, 9 Sep 2006 07:42:11 +0000
Subject: [PATCH] (bug 6893) "Call to a member function exists() on a
 non-object" on trackback.php with bad input

---
 RELEASE-NOTES | 2 +-
 trackback.php | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index a0a402be34..03f41e9140 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -185,7 +185,7 @@ it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
 * Added Xml::option() for generating <option>s easily
 * Localized page numbers in drop-down for DjVu page selection
 * Fixed linktrail for vi
-
+* (bug 6893) "Call to a member function exists() on a non-object" on trackback.php with bad input
 
 == Languages updated ==
 
diff --git a/trackback.php b/trackback.php
index ae1e32b25a..6d2d826b9b 100644
--- a/trackback.php
+++ b/trackback.php
@@ -50,7 +50,7 @@ $tbname = $_POST['blog_name'];
 $tbarticle = $_REQUEST['article'];
 
 $title = Title::newFromText($tbarticle);
-if (!$title->exists())
+if (!isset($title) || !$title->exists())
 	XMLerror("Specified article does not exist.");
 
 $dbw->insert('trackbacks', array(
-- 
2.20.1