diff --git a/ps_mainmenu.php b/ps_mainmenu.php
index 2f8ae33..1aa89bd 100644
--- a/ps_mainmenu.php
+++ b/ps_mainmenu.php
@@ -23,6 +23,9 @@
  * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
  * International Registered Trademark & Property of PrestaShop SA
  */
+if (!defined('_PS_VERSION_')) {
+    exit;
+}
 
 use PrestaShop\PrestaShop\Core\Module\WidgetInterface;