diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index f173caff565..e7f487b6e6e 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -847,7 +847,7 @@ class Message(models.Model):
                 ('email', '!=', self_sudo.author_id.email or self_sudo.email_from),
             ])._notify(self, force_send=force_send, send_after_commit=send_after_commit, user_signature=user_signature)
 
-        notif_users.mapped('partner_id')._notify_by_chat(self)
+        notif_partners._notify_by_chat(self)
 
         channels_sudo._notify(self)