diff --git a/inc/formanswer.class.php b/inc/formanswer.class.php
index bcf27ea8c..2bec3ea5f 100644
--- a/inc/formanswer.class.php
+++ b/inc/formanswer.class.php
@@ -609,6 +609,7 @@ public function showForm($ID, $options = []) {
       . ' class="plugin_formcreator_form"'
       . ' action="' . $formUrl . '"'
       . ' id="plugin_formcreator_form"'
+      . ' data-submit-once="true"'
       . '>';
 
       $form = $this->getForm();