From b07d08a235856f52b6f2078820ff494653da634a Mon Sep 17 00:00:00 2001
From: Ralf Becker <RalfBecker@outdoor-training.de>
Date: Mon, 15 Nov 2021 08:00:14 +0100
Subject: [PATCH] fix PHP 8.0 TypeError: Cannot access offset of type string on
 string

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

diff --git a/calendar/inc/class.calendar_merge.inc.php b/calendar/inc/class.calendar_merge.inc.php
index af6969920d..39c5c44a1a 100644
--- a/calendar/inc/class.calendar_merge.inc.php
+++ b/calendar/inc/class.calendar_merge.inc.php
@@ -777,7 +777,7 @@ class calendar_merge extends Api\Storage\Merge
 		else if((strpos($content, '$$pagerepeat') !== false || strpos($content, '{{pagerepeat') !== false)
 			&& ((strpos($content, '$$range') === false && strpos($content, '{{range') === false)))
 		{
-			if(is_array($ids) && $ids[0] && !$ids[0]['id'])
+			if (is_array($ids) && !empty($ids[0]) && !(is_array($ids[0]) || isset($ids[0]['id'])))
 			{
 				foreach($ids as $range)
 				{