From a5da776d2734f7aae1091d084f0eea978edb57ff Mon Sep 17 00:00:00 2001
From: Daniele Scasciafratte <mte90net@gmail.com>
Date: Fri, 29 Apr 2022 21:55:32 +0200
Subject: [PATCH] Fix undefined error (#1129)

---
 client/src/index.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/client/src/index.php b/client/src/index.php
index 8d1b2114..39884faa 100755
--- a/client/src/index.php
+++ b/client/src/index.php
@@ -27,7 +27,7 @@
             globalIndexPath = "<?=$path ?>";
             showLogs = false;
         </script>
-        <?php if (preg_match('~MSIE|Internet Explorer~i', $_SERVER['HTTP_USER_AGENT']) || (strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0; rv:11.0') !== false)): ?>
+        <?php if ((isset($_SERVER['HTTP_USER_AGENT']) && (preg_match('~MSIE|Internet Explorer~i', $_SERVER['HTTP_USER_AGENT']) || (strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0; rv:11.0') !== false))): ?>
           <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=String.prototype.startsWith,Array.from,Array.prototype.fill,Array.prototype.keys,Array.prototype.find,Array.prototype.findIndex,Array.prototype.includes,String.prototype.repeat,Number.isInteger,Promise&flags=gated"></script>
         <?php endif; ?>
         <script src="<?=$url ?>/bundle.js"></script>