Make DisplayNameCache return null if user doesn't exists

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

1 files changed, 1 insertions, 1 deletions

diff --git a/apps/files_sharing/lib/Cache.php b/apps/files_sharing/lib/Cache.php
index 9f11431008f..707b64b79d7 100644
--- a/apps/files_sharing/lib/Cache.php
+++ b/apps/files_sharing/lib/Cache.php
@@ -170,7 +170,7 @@ class Cache extends CacheJail {
 	private function getOwnerDisplayName() {
 		if (!$this->ownerDisplayName) {
 			$uid = $this->storage->getOwner('');
-			$this->ownerDisplayName = $this->displayNameCache->getDisplayName($uid);
+			$this->ownerDisplayName = $this->displayNameCache->getDisplayName($uid) ?? $uid;
 		}
 		return $this->ownerDisplayName;
 	}