diff --git a/erpnext/buying/doctype/request_for_quotation/mapper.py b/erpnext/buying/doctype/request_for_quotation/mapper.py
index b435bb607f5..77e9f02db85 100644
--- a/erpnext/buying/doctype/request_for_quotation/mapper.py
+++ b/erpnext/buying/doctype/request_for_quotation/mapper.py
@@ -57,8 +57,7 @@ def make_supplier_quotation_from_rfq(
 # This method is used to make supplier quotation from supplier's portal.
 @frappe.whitelist()
 def create_supplier_quotation(doc: str | Document | dict):
-	if isinstance(doc, str):
-		doc = json.loads(doc)
+	doc = frappe.parse_json(doc)
 
 	if frappe.session.user not in frappe.get_all(
 		"Portal User", {"parent": doc.get("supplier")}, pluck="user"