diff --git a/front/form_validator.form.php b/front/form_validator.form.php
index 977c879e9..67d550c00 100644
--- a/front/form_validator.form.php
+++ b/front/form_validator.form.php
@@ -40,6 +40,7 @@
 
 if (!isset($_POST['plugin_formcreator_forms_id'])) {
    // should not happen
+   Html::back();
 }
 $formId = (int) $_POST['plugin_formcreator_forms_id'];
 $formValidator = new PluginFormcreatorForm_Validator();
@@ -55,4 +56,5 @@
       'validation_percent' => $_POST['validation_percent'],
    ]);
    Html::redirect($form->getFormURLWithID($formId));
-}
\ No newline at end of file
+}
+Html::back();
\ No newline at end of file