From 72e354b0b91b01a59e50082300fc09b7fb9b24ca Mon Sep 17 00:00:00 2001
From: Reedy <reedy@wikimedia.org>
Date: Sat, 28 Apr 2012 22:39:00 +0100
Subject: [PATCH] Fatal error:  Call to a member function getId() on a
 non-object in
 /usr/local/apache/common-local/php-1.20wmf1/includes/EditPage.php on line 822

getNext() can return null!

Change-Id: I76a8e50076165d89c90796c6e925913c64722a3a
---
 includes/EditPage.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/EditPage.php b/includes/EditPage.php
index dce8d91042..015099a5f6 100644
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -819,7 +819,7 @@ class EditPage {
 
 							# If we just undid one rev, use an autosummary
 							$firstrev = $oldrev->getNext();
-							if ( $firstrev->getId() == $undo ) {
+							if ( $firstrev && $firstrev->getId() == $undo ) {
 								$undoSummary = wfMsgForContent( 'undo-summary', $undo, $undorev->getUserText() );
 								if ( $this->summary === '' ) {
 									$this->summary = $undoSummary;
-- 
2.20.1