diff --git a/addons/sale_loyalty_delivery/models/sale_order.py b/addons/sale_loyalty_delivery/models/sale_order.py
index 88e22bada2e..cd2f064690b 100644
--- a/addons/sale_loyalty_delivery/models/sale_order.py
+++ b/addons/sale_loyalty_delivery/models/sale_order.py
@@ -36,7 +36,7 @@ class SaleOrder(models.Model):
         return order_line.filtered(lambda line: not line.is_delivery)
 
     def _get_reward_values_free_shipping(self, reward, coupon, **kwargs):
-        delivery_line = self.order_line.filtered(lambda l: l.is_delivery)
+        delivery_line = self.order_line.filtered(lambda l: l.is_delivery)[:1]
         taxes = delivery_line.product_id.taxes_id.filtered(lambda t: t.company_id.id == self.company_id.id)
         taxes = self.fiscal_position_id.map_tax(taxes)
         max_discount = reward.discount_max_amount or float('inf')