diff --git a/mass_mailing_partner/__manifest__.py b/mass_mailing_partner/__manifest__.py
index f528523..413d359 100644
--- a/mass_mailing_partner/__manifest__.py
+++ b/mass_mailing_partner/__manifest__.py
@@ -5,7 +5,7 @@
 
 {
     "name": "Link partners with mass-mailing",
-    "version": "12.0.1.0.1",
+    "version": "12.0.1.0.2",
     "author": "Tecnativa, "
               "Odoo Community Association (OCA)",
     "website": "https://github.com/OCA/social",
diff --git a/mass_mailing_partner/wizard/partner_mail_list_wizard.py b/mass_mailing_partner/wizard/partner_mail_list_wizard.py
index 0977e3d..2978bc6 100644
--- a/mass_mailing_partner/wizard/partner_mail_list_wizard.py
+++ b/mass_mailing_partner/wizard/partner_mail_list_wizard.py
@@ -22,9 +22,9 @@ class PartnerMailListWizard(models.TransientModel):
         contact_obj = self.env['mail.mass_mailing.contact']
         partners = self.partner_ids
 
-        add_list = partners.filtered(lambda r: r.mass_mailing_contact_ids)
-        if add_list:
-            add_list.mass_mailing_contact_ids[0].list_ids |= self.mail_list_id
+        add_list = partners.filtered('mass_mailing_contact_ids')
+        for partner in add_list:
+            partner.mass_mailing_contact_ids[0].list_ids |= self.mail_list_id
 
         to_create = partners - add_list
         for partner in to_create: