diff --git a/addons/mail/mail_followers.py b/addons/mail/mail_followers.py
index 94e1f488ef7..762a421531d 100644
--- a/addons/mail/mail_followers.py
+++ b/addons/mail/mail_followers.py
@@ -161,7 +161,7 @@ class mail_notification(osv.Model):
         if signature:
             body_html = tools.append_content_to_html(body_html, signature)
 
-        partner_email = [partner.email for partner in msg.partner_ids] if msg.partner_ids else []
+        partner_email = [partner.email for partner in msg.partner_ids]
         mail_values = {
             'mail_message_id': msg.id,
             'email_to': partner_email,