diff --git a/src/Atst/StackBackstage.php b/src/Atst/StackBackstage.php
index 35d5f69..7a6d533 100644
--- a/src/Atst/StackBackstage.php
+++ b/src/Atst/StackBackstage.php
@@ -20,7 +20,7 @@ public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQ
     {
         $path = realpath($this->path);
 
-        if (false !== $path) {
+        if (false !== $path  && is_readable($path)) {
             return new Response(file_get_contents($path), 503);
         }