diff --git a/addons/loyalty/models/loyalty_program.py b/addons/loyalty/models/loyalty_program.py
index 848a41df1c9..fd4d174045e 100644
--- a/addons/loyalty/models/loyalty_program.py
+++ b/addons/loyalty/models/loyalty_program.py
@@ -195,7 +195,7 @@ class LoyaltyProgram(models.Model):
     def _compute_payment_program_discount_product_id(self):
         for program in self:
             if program.is_payment_program:
-                program.payment_program_discount_product_id = program.reward_ids[0].discount_line_product_id
+                program.payment_program_discount_product_id = program.reward_ids[:1].discount_line_product_id
             else:
                 program.payment_program_discount_product_id = False