diff --git a/app/javascript/widget/api/endPoints.js b/app/javascript/widget/api/endPoints.js
index 8ede38056..e6ada5914 100755
--- a/app/javascript/widget/api/endPoints.js
+++ b/app/javascript/widget/api/endPoints.js
@@ -52,7 +52,9 @@ const sendAttachment = ({ attachment, replyTo = null }) => {
 
   formData.append('message[referer_url]', referrerURL);
   formData.append('message[timestamp]', timestamp);
-  formData.append('message[reply_to]', replyTo);
+  if (replyTo !== null) {
+    formData.append('message[reply_to]', replyTo);
+  }
   return {
     url: `/api/v1/widget/messages${window.location.search}`,
     params: formData,