From 006cb77310a015741f11dcf927b7f7763cea1aac Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue, 11 Feb 2020 08:21:11 +0100
Subject: [PATCH] Fix PHP Fatal error: Call to undefined method
 kolab_chat_mattermost::https_check() (Bifrost#T329858)

---
 plugins/kolab_chat/drivers/mattermost.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/kolab_chat/drivers/mattermost.php b/plugins/kolab_chat/drivers/mattermost.php
index 342d585c..eb90d644 100644
--- a/plugins/kolab_chat/drivers/mattermost.php
+++ b/plugins/kolab_chat/drivers/mattermost.php
@@ -347,7 +347,7 @@ class kolab_chat_mattermost
         }
 
         $cookie = session_get_cookie_params();
-        $secure = $cookie['secure'] || self::https_check();
+        $secure = $cookie['secure'] || rcube_utils::https_check();
 
         if ($domain = $this->rc->config->get('kolab_chat_session_domain')) {
             $cookie['domain'] = $domain;