From 416efb62b49d9509b1e9d86a500e24a101b93e7a Mon Sep 17 00:00:00 2001
From: Dion Hulse <dd32@git.wordpress.org>
Date: Sat, 11 Dec 2010 06:35:47 +0000
Subject: [PATCH] Check to see if WP_Query has returned any posts before
 blindly accessing posts. Fixes #15771

git-svn-id: https://develop.svn.wordpress.org/trunk@16872 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/rewrite.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-includes/rewrite.php b/wp-includes/rewrite.php
index 9be80de521..9bdab3601e 100644
--- a/wp-includes/rewrite.php
+++ b/wp-includes/rewrite.php
@@ -337,7 +337,7 @@ function url_to_postid($url) {
 
 			// Do the query
 			$query = new WP_Query($query);
-			if ( $query->is_single || $query->is_page )
+			if ( !empty($query->posts) && ($query->is_single || $query->is_page) )
 				return $query->post->ID;
 			else
 				return 0;