From 264d22599df157b2f88ef81b05400a93712434b9 Mon Sep 17 00:00:00 2001
From: Ralf Becker <RalfBecker@outdoor-training.de>
Date: Mon, 30 Aug 2021 08:54:35 +0200
Subject: [PATCH] quiten warning if client sends no User-Agent header

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

diff --git a/index.php b/index.php
index faef439c9a..836ee9f252 100755
--- a/index.php
+++ b/index.php
@@ -16,7 +16,7 @@ use EGroupware\Api\Egw;
 
 // Rocket.Chat desktop clients ignore /rocketchat/ path in URL and use just /
 // --> redirect them back to /rocketchat/
-if (strpos($_SERVER['HTTP_USER_AGENT'], 'Rocket.Chat') !== false)
+if (strpos($_SERVER['HTTP_USER_AGENT'] ?? '', 'Rocket.Chat') !== false)
 {
 	header('Location: /rocketchat/');
 	exit;