From 6e17dbba380776f96ffc6a941c5415d550aaa915 Mon Sep 17 00:00:00 2001
From: Anna Larch <anna@nextcloud.com>
Date: Tue, 11 Jul 2023 10:58:17 +0200
Subject: [PATCH] fixup! Use recurrence instance to build iMip email

---
 apps/dav/lib/CalDAV/Schedule/IMipPlugin.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
index 041cab77bf6fb..2b4e248407e64 100644
--- a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -166,8 +166,13 @@ public function schedule(Message $iTipMessage) {
 			return;
 		}
 
+		$mailto = $iTipMessage->recipient;
+		if($mailto === null) {
+			return;
+		}
+
 		// Strip off mailto:
-		$recipient = substr($iTipMessage->recipient, 7);
+		$recipient = substr($mailto, 7);
 		if (!$this->mailer->validateMailAddress($recipient)) {
 			// Nothing to send if the recipient doesn't have a valid email address
 			$iTipMessage->scheduleStatus = '5.0; EMail delivery failed';