diff --git a/lib/private/Files/Cache/Wrapper/CacheJail.php b/lib/private/Files/Cache/Wrapper/CacheJail.php
index 357851bedd529e259635ac5688084326d69e1a39..1ad00ba44c5317decefa8805ad8b64e4f223496b 100644
--- a/lib/private/Files/Cache/Wrapper/CacheJail.php
+++ b/lib/private/Files/Cache/Wrapper/CacheJail.php
@@ -312,6 +312,10 @@ class CacheJail extends CacheWrapper {
 	 */
 	public function getPathById($id) {
 		$path = $this->getCache()->getPathById($id);
+		if ($path === null) {
+			return null;
+		}
+
 		return $this->getJailedPath($path);
 	}