Adjustment to home delivery module

I was getting a deprecated command error with litecart and PHP 8.2 for the below:

$customer['shipping_address']['postcode'] = preg_replace('#([0-9]{3})-?([0-9]{2})#', '$1$2',
$customer['shipping_address']['postcode']);

This was the fix:

if (isset($customer['shipping_address']['postcode'])) {
    $postcode = $customer['shipping_address']['postcode'];
    $postcode = preg_replace('#([0-9]{3})-?([0-9]{2})#', '$1$2', $postcode);
    $customer['shipping_address']['postcode'] = $postcode;
}

What file is this? PHP 8.2 will go bananas if passing null when expecting a string argument.

Sorry tim its the sm_home_delivery.inc file from the addon library - https://www.litecart.net/en/addons/152/home-delivery

It notes compatibility to 1.3.6

but with this code modification it works with 2.5.4 and PHP 8.2

Ok, I moved this forum topic from Feature Requests to the Addons section, connecting it to the right addon. For Public Domain addons you are allowed to upload updates of the addons directly on the addon page.