diff --git a/erpnext/buying/utils.py b/erpnext/buying/utils.py
index 9146c58..9ad1c5c 100644
--- a/erpnext/buying/utils.py
+++ b/erpnext/buying/utils.py
@@ -64,7 +64,7 @@
 		validate_end_of_life(d.item_code, item.end_of_life, item.disabled)
 
 		# validate stock item
-		if item.is_stock_item==1 and d.qty and not d.warehouse and not d.delivered_by_supplier:
+		if item.is_stock_item==1 and d.qty and not d.warehouse and not d.get("delivered_by_supplier"):
 			frappe.throw(_("Warehouse is mandatory for stock Item {0} in row {1}").format(d.item_code, d.idx))
 
 		items.append(cstr(d.item_code))