diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index bf899a0e70e39b5a7b6c89b8a3607a5d272bbcef..9d8d37d3ce12b9b2166bbc1eb1c1c80455246d6a 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -112,10 +112,13 @@ erpnext.accounts.SalesInvoiceController = class SalesInvoiceController extends e
 				return item.is_delivered_by_supplier ? true : false;
 			})
 
-			if(doc.outstanding_amount >= 0 || Math.abs(flt(doc.outstanding_amount)) < flt(doc.grand_total)) {
-				cur_frm.add_custom_button(__('Return / Credit Note'),
-					this.make_sales_return, __('Create'));
-				cur_frm.page.set_inner_btn_group_as_primary(__('Create'));
+			if (doc.outstanding_amount >= 0 || Math.abs(flt(doc.outstanding_amount)) < flt(doc.grand_total)) {
+				this.frm.add_custom_button(
+					__("Return / Credit Note"),
+					this.make_sales_return.bind(this),
+					__("Create")
+				);
+				this.frm.page.set_inner_btn_group_as_primary(__("Create"));
 			}
 
 			if(cint(doc.update_stock)!=1) {