diff --git a/apps/files_sharing/lib/Cache.php b/apps/files_sharing/lib/Cache.php
index bb1467ea827..edd7ab3186f 100644
--- a/apps/files_sharing/lib/Cache.php
+++ b/apps/files_sharing/lib/Cache.php
@@ -67,7 +67,7 @@ class Cache extends CacheJail {
 
 		parent::__construct(
 			null,
-			null
+			''	
 		);
 	}