diff --git a/web_widget_mail_send_odoo/static/src/js/web_widget_mail_send_odoo.js b/web_widget_mail_send_odoo/static/src/js/web_widget_mail_send_odoo.js
index 9d9335a31..7837db5de 100644
--- a/web_widget_mail_send_odoo/static/src/js/web_widget_mail_send_odoo.js
+++ b/web_widget_mail_send_odoo/static/src/js/web_widget_mail_send_odoo.js
@@ -53,7 +53,7 @@ openerp.web_widget_mail_send_odoo = function(instance) {
                                         // refresh the chatter widget here
                                         $.each(self.view.getChildren(),
                                             function(index, value){
-                                                if(value.widget=='mail_thread'){
+                                                if(value.root && value.root.thread && value.root.thread.message_fetch){
                                                     value.root.thread.message_fetch()
                                                 }
                                             }