catalog/controller/startup/startup.php

if (isset($this->session->data['shipping_address'])) {

改為

if (isset($this->session->data['shipping_address']['country_id']) && isset($this->session->data['shipping_address']['zone_id'])) {

if (isset($this->session->data['payment_address'])) {

改為

if (isset($this->session->data['payment_address']['country_id']) && isset($this->session->data['payment_address']['zone_id'])) {