Issue #3388109: Big Menu throw critical error when domain language negotiation in enabled

src/BigMenuForm.php

@@ -281,7 +281,7 @@ class BigMenuForm extends MenuForm {
    */
   public function save(array $form, FormStateInterface $form_state) {
     parent::save($form, $form_state);
-    $form_state->setRedirectUrl(Url::fromUserInput($this->getRedirectDestination()->get()));
+    $form_state->setRedirectUrl(Url::fromUserInput($this->getRequest()->getRequestUri()));
   }
 
   /**