From ef0964b3d826805a16f75928da27e143f120aeea Mon Sep 17 00:00:00 2001
From: Ralf Becker <RalfBecker@outdoor-training.de>
Date: Fri, 5 Nov 2021 11:22:49 +0100
Subject: [PATCH] fix PHP 8.0 error: calendar_boupdate::update(): Argument #6
 ($messages) cannot be passed by reference

---
 calendar/inc/class.calendar_uiforms.inc.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index bedef318c8..0a6cadda87 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -984,7 +984,8 @@ class calendar_uiforms extends calendar_ui
 							$exception['recurrence'] += $offset;
 							$exception['reference'] = $event['id'];
 							$exception['uid'] = $event['uid'];
-							$this->bo->update($exception, true, true, true, true, $msg=null, $content['no_notifications']);
+							$msg = null;
+							$this->bo->update($exception, true, true, true, true, $msg, $content['no_notifications']);
 						}
 					}
 				}