diff --git a/utility.php b/utility.php
index 11f27db7..6c1d0fcc 100644
--- a/utility.php
+++ b/utility.php
@@ -212,6 +212,8 @@ function msz_server_timing(\Index\Performance\Timings $timings): string {
 
 function msz_cookie_domain(bool $compatible = true): string {
     $url = parse_url($_SERVER['HTTP_HOST'], PHP_URL_HOST);
+    if(empty($url))
+        $url = $_SERVER['HTTP_HOST'];
 
     if(!filter_var($url, FILTER_VALIDATE_IP) && $compatible)
         $url = '.' . $url;