1 files changed, 1 insertions, 1 deletions
diff --git a/addons/mail/static/src/js/thread_windows/abstract_thread_window.js b/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
index 0af2d1080db..d6a637a0552 100644
--- a/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
+++ b/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
@@ -404,7 +404,7 @@ var AbstractThreadWindow = Widget.extend({
         this._thread.postMessage(messageData)
             .then(function () {
                 self._threadWidget.scrollToBottom();
-                callback();
+                callback && callback();
             });
     },
     /**