From 0e15d15f9b1c7ef4171960d070619e3fb1e23857 Mon Sep 17 00:00:00 2001
From: matt <matt@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Wed, 3 Aug 2005 00:30:40 +0000
Subject: [PATCH] Fixes #1541

git-svn-id: http://svn.automattic.com/wordpress/trunk@2742 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 xmlrpc.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xmlrpc.php b/xmlrpc.php
index b17a8de85..35af5ff4b 100644
--- a/xmlrpc.php
+++ b/xmlrpc.php
@@ -1243,6 +1243,9 @@ class wp_xmlrpc_server extends IXR_Server {
 			}
 		}
 
+		if ( empty($context) ) // URL pattern not found
+			return new IXR_Error(17, 'The source URI does not contain a link to the target URI, and so cannot be used as a source.');
+
 		$pagelinkedfrom = preg_replace('#&([^amp\;])#is', '&amp;$1', $pagelinkedfrom);
 
 		$context = '[...] ' . wp_specialchars( $excerpt ) . ' [...]';