From 3b5dd77275edc06c504253a84b801a7c1c0e8076 Mon Sep 17 00:00:00 2001
From: Vincent Petry <vincent@nextcloud.com>
Date: Wed, 15 Dec 2021 14:25:39 +0100
Subject: [PATCH] Discard share notification for non-existing groups

Group shares might exist even after a group got deleted.

This fix catches the situation and discards the notification for the
obsolete group.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>
Co-authored-by: Joas Schilling <coding@schilljs.com>
---
 apps/files_sharing/lib/Notification/Notifier.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/files_sharing/lib/Notification/Notifier.php b/apps/files_sharing/lib/Notification/Notifier.php
index 2499896653b0d..22cf83b547737 100644
--- a/apps/files_sharing/lib/Notification/Notifier.php
+++ b/apps/files_sharing/lib/Notification/Notifier.php
@@ -193,7 +193,7 @@ protected function parseShareInvitation(IShare $share, INotification $notificati
 				}
 
 				$group = $this->groupManager->get($share->getSharedWith());
-				if (!$group->inGroup($user)) {
+				if ($group === null || !$group->inGroup($user)) {
 					throw new AlreadyProcessedException();
 				}