diff --git a/modules/ticket/back/methods/ticket/transferSales.js b/modules/ticket/back/methods/ticket/transferSales.js
index 54306510c4..5f5fdde674 100644
--- a/modules/ticket/back/methods/ticket/transferSales.js
+++ b/modules/ticket/back/methods/ticket/transferSales.js
@@ -83,12 +83,12 @@ module.exports = Self => {
 
             for (const sale of sales) {
                 const originalSale = map.get(sale.id);
-                if (sale.quantity == originalSale.quantity) {
+                if (sale.quantity == originalSale?.quantity) {
                     query = `UPDATE sale
                                 SET ticketFk = ?
                                 WHERE id = ?`;
                     await Self.rawSql(query, [ticketId, sale.id], myOptions);
-                } else if (sale.quantity != originalSale.quantity) {
+                } else if (sale.quantity != originalSale?.quantity) {
                     await transferPartialSale(
                         ticketId, originalSale, sale, myOptions);
                 }