From bdca103af13cf846a195328c69264d3ec632056b Mon Sep 17 00:00:00 2001
From: Andreas Gohr <andi@splitbrain.org>
Date: Fri, 22 May 2015 14:39:25 +0200
Subject: [PATCH] avoid accessing nonexistant array key. fixes #1165

---
 inc/html.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/inc/html.php b/inc/html.php
index 2564c3bd6..2f10e3c08 100644
--- a/inc/html.php
+++ b/inc/html.php
@@ -1409,7 +1409,13 @@ function html_diff_navigation($pagelog, $type, $l_rev, $r_rev) {
 
     // last timestamp is not in changelog, retrieve timestamp from metadata
     // note: when page is removed, the metadata timestamp is zero
-    $r_rev = $r_rev ? $r_rev : $INFO['meta']['last_change']['date'];
+    if(!$r_rev) {
+        if(isset($INFO['meta']['last_change']['date'])) {
+            $r_rev = $INFO['meta']['last_change']['date'];
+        } else {
+            $r_rev = 0;
+        }
+    }
 
     //retrieve revisions with additional info
     list($l_revs, $r_revs) = $pagelog->getRevisionsAround($l_rev, $r_rev);
-- 
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