diff --git a/erpnext/accounts/doctype/loyalty_program/test_loyalty_program.py b/erpnext/accounts/doctype/loyalty_program/test_loyalty_program.py
index a79109bcd2b..64adce9ec15 100644
--- a/erpnext/accounts/doctype/loyalty_program/test_loyalty_program.py
+++ b/erpnext/accounts/doctype/loyalty_program/test_loyalty_program.py
@@ -80,6 +80,7 @@ class TestLoyaltyProgram(unittest.TestCase):
 		si_original = create_sales_invoice_record()
 		si_original.insert()
 		si_original.submit()
+		customer.reload()
 
 		earned_points = get_points_earned(si_original)
 
@@ -102,8 +103,8 @@ class TestLoyaltyProgram(unittest.TestCase):
 		si_redeem.loyalty_points = earned_points
 		si_redeem.insert()
 		si_redeem.submit()
+		customer.reload()
 
-		customer = frappe.get_doc("Customer", {"customer_name": "Test Loyalty Customer"})
 		earned_after_redemption = get_points_earned(si_redeem)
 
 		lpe_redeem = frappe.get_doc(
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 978c1ad021c..6e8f1b2bbf2 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -1776,7 +1776,8 @@ class SalesInvoice(SellingController):
 			loyalty_program=self.loyalty_program,
 			include_expired_entry=True,
 		)
-		frappe.db.set_value("Customer", self.customer, "loyalty_program_tier", lp_details.tier_name)
+		customer = frappe.get_doc("Customer", self.customer)
+		customer.db_set("loyalty_program_tier", lp_details.tier_name)
 
 	def get_returned_amount(self):
 		from frappe.query_builder.functions import Sum