diff --git a/lib/CacheWrapper.php b/lib/CacheWrapper.php
index b86373f4..23549732 100644
--- a/lib/CacheWrapper.php
+++ b/lib/CacheWrapper.php
@@ -55,7 +55,7 @@ public function __construct(ICache $cache, IStorage $storage, Operation $operati
 	public const PERMISSION_DELETE = 8;
 
 	protected function formatCacheEntry($entry) {
-		if (isset($entry['path']) && isset($entry['permissions'])) {
+		if (isset($entry['path']) && isset($entry['permissions']) && $this->storage->getWrapperStorage() !== null) {
 			try {
 				$this->operation->checkFileAccess($this->storage, $entry['path'], $entry['mimetype'] === 'httpd/unix-directory');
 			} catch (ForbiddenException $e) {