diff --git a/mass_mailing_statistic_extra/models/mail_mail.py b/mass_mailing_statistic_extra/models/mail_mail.py
index f7e426dd..87796d42 100644
--- a/mass_mailing_statistic_extra/models/mail_mail.py
+++ b/mass_mailing_statistic_extra/models/mail_mail.py
@@ -30,4 +30,4 @@ class MailMail(models.Model):
                     'email_to': ';'.join(email_list),
                     'subject': mail.subject,
                 })
-        return mail
+        return mail_id