See if adding the code in RED fixes the problem in the file:
/includes/modules/shipping_estimator.php
Code:
// set shipping to null ! multipickjup changes address to store address...
$shipping='';
// include the order class (uses the sendto !)
require(DIR_WS_CLASSES . 'order.php');
$order = new order;
}else{
// include the order class (uses the sendto !)
require(DIR_WS_CLASSES . 'order.php');
$order = new order;
// user not logged in !
if (isset($_POST['zone_country_id'])){
// country is selected
$_SESSION['country_info'] = zen_get_countries($_POST['zone_country_id'],true);
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