diff --git a/erpnext/accounts/report/gross_profit/gross_profit.py b/erpnext/accounts/report/gross_profit/gross_profit.py
index 25958692a22594b66ce1339ba52f86642dadba54..9ec697617c9867c02004877bb8b23cf640e912a5 100644
--- a/erpnext/accounts/report/gross_profit/gross_profit.py
+++ b/erpnext/accounts/report/gross_profit/gross_profit.py
@@ -656,13 +656,13 @@ class GrossProfitGenerator(object):
 			elif self.delivery_notes.get((row.parent, row.item_code), None):
 				#  check if Invoice has delivery notes
 				dn = self.delivery_notes.get((row.parent, row.item_code))
-				parenttype, parent, item_row, warehouse = (
+				parenttype, parent, item_row, _warehouse = (
 					"Delivery Note",
 					dn["delivery_note"],
 					dn["item_row"],
 					dn["warehouse"],
 				)
-				my_sle = self.get_stock_ledger_entries(item_code, row.warehouse)
+				my_sle = self.get_stock_ledger_entries(item_code, _warehouse)
 				return self.calculate_buying_amount_from_sle(
 					row, my_sle, parenttype, parent, item_row, item_code
 				)