From 80e500591f45193d12a08cadf0c7e1495faf9efe Mon Sep 17 00:00:00 2001
From: Adrien Crivelli <adrien.crivelli@gmail.com>
Date: Fri, 15 Jul 2022 11:44:58 +0200
Subject: [PATCH] Avoid deprecation in PHP 8.1

---
 model/AliasHandler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/model/AliasHandler.php b/model/AliasHandler.php
index fc251d92..b24b71d5 100644
--- a/model/AliasHandler.php
+++ b/model/AliasHandler.php
@@ -470,7 +470,7 @@ class AliasHandler extends PFAHandler
     */
     protected function getVacationAlias()
     {
-        $vacation_goto = str_replace('@', '#', $this->id);
+        $vacation_goto = str_replace('@', '#', $this->id ?? '');
         return $vacation_goto . '@' . Config::read_string('vacation_domain');
     }