diff --git a/common.php b/common.php
index ab49ba9..033273c 100644
--- a/common.php
+++ b/common.php
@@ -222,6 +222,7 @@ function main($path)
             return output('Please visit <a href="' . $tmp . '">' . $tmp . '</a>.', 301, [ 'Location' => $tmp ]);
         }
         if ($_SERVER['admin']) {
+            $_SERVER['disktag'] = '';
             if (!class_exists($_GET['AddDisk'])) require 'disk' . $slash . $_GET['AddDisk'] . '.php';
                 $drive = new $_GET['AddDisk']($_GET['disktag']);
                 return $drive->AddDisk();