diff --git a/public/static/js/rvr.js b/public/static/js/rvr.js
index 45096bb..ccf30b6 100644
--- a/public/static/js/rvr.js
+++ b/public/static/js/rvr.js
@@ -49,7 +49,7 @@ var RVR = {
             document.getElementById('loading').style.visibility = 'visible';
 
             var formData = new FormData(form);
-            var formError = form.getElementsByClassName('formError')[0];
+            var formError = document.getElementsByClassName('formError')[0];
             var pageLeaveOnSuccess = form.dataset.redirectOnSuccess || form.dataset.reloadOnSuccess;
 
             RVR.httpRequest('POST', form.action, function () {