diff --git a/ss/display.php b/ss/display.php
index e0b269bc..7bc3f217 100644
--- a/ss/display.php
+++ b/ss/display.php
@@ -21,7 +21,8 @@
    $auth_file = $_SERVER["DOCUMENT_ROOT"] . "/ss/ip-" . $img;
    $auth_expire = 60 * 60; // You have one hour to remove your content
 
-   if (time() - filemtime($auth_file) < $auth_expire)
+   if (file_exists($auth_file) &&
+       time() - filemtime($auth_file) < $auth_expire)
      {
        $auth = md5($img . get_ip());