diff --git a/data/web/js/build/014-mailcow.js b/data/web/js/build/014-mailcow.js
index bf7e78b11..dc550bb98 100644
--- a/data/web/js/build/014-mailcow.js
+++ b/data/web/js/build/014-mailcow.js
@@ -290,6 +290,7 @@ $(document).ready(function() {
     var tagValuesElem = $(tagboxElem).find(".tag-values")[0];
 
     var tag = escapeHtml($(tagInputElem).val());
+    if (!tag) return;
     var value_tags = [];
     try {
       value_tags = JSON.parse($(tagValuesElem).val());