diff --git a/erpnext/stock/doctype/delivery_note/mapper.py b/erpnext/stock/doctype/delivery_note/mapper.py
index 605a2d22df6..e4a0eaefe93 100644
--- a/erpnext/stock/doctype/delivery_note/mapper.py
+++ b/erpnext/stock/doctype/delivery_note/mapper.py
@@ -66,8 +66,7 @@ def make_sales_invoice(
 
 	if args is None:
 		args = {}
-	if isinstance(args, str):
-		args = json.loads(args)
+	args = frappe.parse_json(args)
 
 	doc = frappe.get_doc("Delivery Note", source_name)