Creating default object from empty value (in shipping modules)

[Ajeh]

See if adding the code in RED fixes the problem in the file:
/includes/modules/shipping_estimator.php

    // 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);