From 6313e8dd95505c46c3b25d102b233846072a7125 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <machniak@kolabsys.com>
Date: Thu, 11 Dec 2025 18:35:45 +0100
Subject: [PATCH] Check node type before getOwner() call

Fixes #1345
---
 lib/CalDAV/Schedule/Plugin.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/CalDAV/Schedule/Plugin.php b/lib/CalDAV/Schedule/Plugin.php
index 8577ae9f70..2ce267ebf4 100644
--- a/lib/CalDAV/Schedule/Plugin.php
+++ b/lib/CalDAV/Schedule/Plugin.php
@@ -378,7 +378,7 @@ public function beforeUnbind($path)
 
         $node = $this->server->tree->getNodeForPath($path);
 
-        if (!$node instanceof ICalendarObject || $node instanceof ISchedulingObject) {
+        if (!$node instanceof ICalendarObject || $node instanceof ISchedulingObject || !$node instanceof DAVACL\IACL) {
             return;
         }
 
@@ -386,10 +386,13 @@ public function beforeUnbind($path)
             return;
         }
 
-        $addresses = $this->getAddressesForPrincipal(
-            $node->getOwner()
-        );
+        $owner = $node->getOwner();
+
+        if (!$owner) {
+            return;
+        }
 
+        $addresses = $this->getAddressesForPrincipal($owner);
         $broker = $this->createITipBroker();
         $messages = $broker->parseEvent(null, $addresses, $node->get());