diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index b361c0c..26d6038 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -916,7 +916,7 @@
 				},
 				callback: function(r, rt) {
 					if(r.message){
-						data = r.message;
+						let data = r.message;
 						frappe.model.set_value(cdt, cdn, "billing_hours", data.billing_hours);
 						frappe.model.set_value(cdt, cdn, "billing_amount", data.billing_amount);
 						frappe.model.set_value(cdt, cdn, "timesheet_detail", data.timesheet_detail);