diff --git a/config/app.php.txt b/config/app.php.txt
index 5c1e56d..8f068c7 100644
--- a/config/app.php.txt
+++ b/config/app.php.txt
@@ -6,7 +6,7 @@ ini_set('display_startup_errors', '1');
 error_reporting(E_ALL);
 
 // Website
-define('WEBSITE_DOMAIN', 'http://' . $_SERVER['HTTP_HOST']);
+define('WEBSITE_DOMAIN', !empty($_SERVER['HTTP_HOST']) ? 'http://' . $_SERVER['HTTP_HOST'] : '');
 
 // Database
 define('DB_NAME', 'database.sqlite');