From 60af5a401315ad69ffcd00648dd7eb7b804b7aee Mon Sep 17 00:00:00 2001
From: Richard Steinmetz <richard@steinmetz.cloud>
Date: Wed, 20 Aug 2025 13:47:28 +0200
Subject: [PATCH] fix(caldav): handle read-only boolean and int values

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>
---
 apps/dav/lib/CalDAV/CalDavBackend.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index d5b0d875ede..a05b47b90ec 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -411,7 +411,10 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 						continue;
 					}
 					if (isset($calendars[$row['id']][$readOnlyPropertyName])
-						&& $calendars[$row['id']][$readOnlyPropertyName] === 0) {
+						&& (
+							$calendars[$row['id']][$readOnlyPropertyName] === 0
+							|| $calendars[$row['id']][$readOnlyPropertyName] === false
+						)) {
 						// Old share is already read-write, no more permissions can be gained
 						continue;
 					}