- if ($item_tax['rate'] !== null) {
- $index = $item_tax['tax_type_id'];
- $rate = isset($ret_tax_array[$index]['rate']) ? $item_tax['rate'] : 0; // use customer tax group on shipment
+ $index = $item_tax['tax_type_id'];
+ if ($item_tax['rate'] !== null && $ret_tax_array[$index]['rate'] !== null) {