From b4676ae7e248354327d27d878fb876a637586fd1 Mon Sep 17 00:00:00 2001
From: Ralf Becker <RalfBecker@outdoor-training.de>
Date: Sat, 20 Nov 2021 08:40:35 +0100
Subject: [PATCH] fix PHP 8.0 TypeError: Unsupported operand types: int | array

---
 calendar/inc/class.calendar_boupdate.inc.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index 9e9b88edb6..f3d913c736 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -1739,7 +1739,7 @@ class calendar_boupdate extends calendar_bo
 				static $memberships=null;
 				if (is_null($memberships))
 				{
-					$memberships = $GLOBALS['egw']->accounts->memberships($user,true);
+					$memberships = $GLOBALS['egw']->accounts->memberships($user,true) ?: [];
 					$memberships[] = $user;
 				}
 				foreach($cat_rights as $uid => $value)