From 7c99ece0e1d83626004d77c2eb62564ae00ae86f Mon Sep 17 00:00:00 2001
From: Andy Miller <rhuk@mac.com>
Date: Fri, 25 Jan 2019 16:49:23 -0700
Subject: [PATCH] make sure HTTP_DNT is set before inspecting it

---
 system/src/Grav/Common/Browser.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/system/src/Grav/Common/Browser.php b/system/src/Grav/Common/Browser.php
index dfe1c58a7..b56bc8e79 100644
--- a/system/src/Grav/Common/Browser.php
+++ b/system/src/Grav/Common/Browser.php
@@ -143,7 +143,7 @@ class Browser
      */
     public function isTrackable(): bool
     {
-        if ($_SERVER['HTTP_DNT'] === '1') {
+        if (isset($_SERVER['HTTP_DNT']) && $_SERVER['HTTP_DNT'] === '1') {
             return false;
         }