diff --git a/addons/mail/static/src/js/mail.js b/addons/mail/static/src/js/mail.js
index 5b42620b260..9133e5de257 100644
--- a/addons/mail/static/src/js/mail.js
+++ b/addons/mail/static/src/js/mail.js
@@ -711,7 +711,9 @@ openerp.mail = function (session) {
             this.$el.fadeOut(fadeTime, function () {
                 self.parent_thread.message_to_expandable(self);
             });
-            this.thread.$el.fadeOut(fadeTime);
+            if (this.thread) {
+                this.thread.$el.fadeOut(fadeTime);
+            }
         },
 
         /**