From c0f44ca44d9530c3658d22c0b3ac311a60cbff6c Mon Sep 17 00:00:00 2001
From: Adrian Lang <mail@adrianlang.de>
Date: Sat, 7 Mar 2009 02:19:38 +0100
Subject: Check if that $_SERVER param is set before accessing.

---
 lib/action.php | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'lib')

diff --git a/lib/action.php b/lib/action.php
index 812df635e..45ce56ac0 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -819,9 +819,8 @@ class Action extends HTMLOutputter // lawsuit
         }
         if ($lm) {
             header('Last-Modified: ' . date(DATE_RFC1123, $lm));
-            $if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
-            if ($if_modified_since) {
-                $ims = strtotime($if_modified_since);
+            if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
+                $ims = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
                 if ($lm <= $ims) {
                     $if_none_match = $_SERVER['HTTP_IF_NONE_MATCH'];
                     if (!$if_none_match ||
-- 
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