diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index 8ab60dbbb1c..cf081635fde 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -288,7 +288,7 @@ class MailThread(models.AbstractModel):
 
         # track values
         if not self._context.get('mail_notrack'):
-            if 'lang' not in self._context:
+            if not self._context.get('lang'):
                 track_threads = threads.with_context(lang=self.env.user.lang)
             else:
                 track_threads = threads