diff --git a/easy_my_coop/models/account_invoice.py b/easy_my_coop/models/account_invoice.py
index 2961085..d97bfd7 100644
--- a/easy_my_coop/models/account_invoice.py
+++ b/easy_my_coop/models/account_invoice.py
@@ -2,11 +2,11 @@
 #   Houssine Bakkali <houssine@coopiteasy.be>
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 
-
+import logging
 from datetime import datetime
 
 from odoo import api, fields, models
-
+_logger = logging.getLogger(__name__)
 
 class AccountInvoice(models.Model):
     _inherit = "account.invoice"
@@ -114,7 +114,7 @@ class AccountInvoice(models.Model):
 
     def send_certificate_email(self, certificate_email_template, sub_reg_line):
         # we send the email with the certificate in attachment
-        certificate_email_template.sudo().send_mail(self.partner_id.id, False)
+        certificate_email_template.sudo().send_mail(self.id, False)
 
     def set_cooperator_effective(self, effective_date):
         sub_register_obj = self.env["subscription.register"]