diff --git a/addons/sale_coupon/models/sale_order.py b/addons/sale_coupon/models/sale_order.py
index 1415aded94c..b8c2b9a8967 100644
--- a/addons/sale_coupon/models/sale_order.py
+++ b/addons/sale_coupon/models/sale_order.py
@@ -239,7 +239,6 @@ class SaleOrder(models.Model):
         return coupon
 
     def _send_reward_coupon_mail(self):
-        self.ensure_one()
         template = self.env.ref('sale_coupon.mail_template_sale_coupon', raise_if_not_found=False)
         if template:
             for coupon in self.generated_coupon_ids: