diff --git a/lib/private/Files/Cache/Cache.php b/lib/private/Files/Cache/Cache.php
index dc6ab6dae2212..5dded8c32dd38 100644
--- a/lib/private/Files/Cache/Cache.php
+++ b/lib/private/Files/Cache/Cache.php
@@ -540,7 +540,7 @@ public function inCache($file) {
 	public function remove($file) {
 		$entry = $this->get($file);
 
-		if ($entry) {
+		if ($entry instanceof ICacheEntry) {
 			$query = $this->getQueryBuilder();
 			$query->delete('filecache')
 				->whereFileId($entry->getId());