Technical Error on Supercheckout module in PrestaShop 1.7

[acbr5]

I have a problem in PrestaShop 1.7.7.8 and I use supercheckout module.

If I override classes/Validate.php file to the override folder, and edit some regex epressions I get the error: "Technical Error-Request Failed". (Picture 1). If I revert the epression back the problem goes away. And the other point is this error seems just for guest users. If I log in and go to the supercheckout page, I won't see any error and it will work fine. So I want to edit Regex expressions.

I tried to find the solution. I found that the error is defined inside that file: \modules\supercheckout\views\templates\front\supercheckout.tpl

I got it in the comment line. (Picture 2). And I got the error in the third picture (Picture 3).

The id_address_delivery variable is empty. If I set a value 1 to this variable, it works fine the first time, but if I go to the page to purchase products again, I encounter the error in the fourth picture (Picture 4). Finally that is my Regex expressions (**Picture 5**😞

So the problem is in the Ajax request (modules/supercheckout/views/js/front/supercheckout.js), but I cannot find it:

   var shipping_error_found_on_load = false;
   function loadCarriers() {
      var requestParam = getCounrtryAndIdDelivery();
      var id_country = requestParam[0];
      var id_state = 0;
      if (checkStateVisibility(id_country, 'select[name="shipping_address[id_state]"]')) {
          id_state = $('select[name="shipping_address[id_state]"]').val();
      }
      var postcode = $('input[name="shipping_address[postcode]"]').val();
      var id_address_delivery = requestParam[1];
      var vat_code = '';
      if ($('input[name="shipping_address[vat_number]"]').val() != 'undefined' && 
  $('input[name="shipping_address[vat_number]"]').val() != '' && 
  $('input[name="shipping_address[vat_number]"]').val() != null) {
          vat_code = $('input[name="shipping_address[vat_number]"]').val();
      }
      shipping_error_found_on_load = false;
      $.ajax({
          type: 'POST',
          headers: {
              "cache-control": "no-cache"
          },
          url: getURLwithTime($('#module_url').val()),
          async: true,
          cache: false,
          dataType: "json",
          data: 'ajax=true' + '&id_country=' + id_country + '&id_state=' + id_state + '&postcode=' + postcode + '&vat_number=' + vat_code + '&id_address_delivery=' + id_address_delivery + '&method=loadCarriers&token=' + prestashop.static_token,
          beforeSend: function() {
              alert(8541);
              $('.kb_velsof_sc_overlay').show();$('.pay-loader').show();
              $('#shippingMethodLoader').show();
              $('#shipping_method_update_warning .permanent-warning').remove();
              alert(8888);
          },
          complete: function() {
              alert(77777);
              $('.kb_velsof_sc_overlay').hide();$('.pay-loader').hide();
              $('#shippingMethodLoader').hide();
          },
          success: function(jsonData) {
              if (jsonData['hasError']) {
                  $('#shipping-method').html('');
                  $('#shipping_method_update_warning').html('<div class="permanent-warning">' + jsonData['shipping_error'][0] + '</div>');
              } else {
                  $('#shipping-method').html(jsonData['html']);
              }
              $('.delivery_option_radio:checked').closest('li').addClass('alert-info');
              set_column_inside_height();
              //loadCart();
              /* Start Code Added By Priyanshu on 11-Feb-2021 for the packetery ( Zasilkovna ) compatibility */
              if (typeof onShippingLoadedCallback !== 'undefined') {
                  onShippingLoadedCallback();
              }
              /* End Code Added By Priyanshu on 11-Feb-2021 for the packetery ( Zasilkovna ) compatibility */
              updateCarrierOnDeliveryChange()
          },
          error: function(XMLHttpRequest, textStatus, errorThrown) {
              var errors = sprintf(ajaxRequestFailedMsg, XMLHttpRequest, textStatus);
              $('#shipping_method_update_warning').html('<div class="permanent-warning">' + errors + '</div>');
              $('.kb_velsof_sc_overlay').hide();$('.pay-loader').hide();
          }
      });
}
function getCounrtryAndIdDelivery() {
      var id_country = 0;
      var id_address_delivery = '';
      if ($('input[name="shipping_address_value"]').length) {
          if ($('input[name="shipping_address_value"]:checked').val() == 1) {
              id_country = $('select[name="shipping_address[id_country]"] option:selected').val();
          } else if ($('input[name="shipping_address_value"]:checked').val() == 0) {
              id_address_delivery = $('select[name="shipping_address_id"] option:selected').val();
          }
    } else {
        id_country = $('select[name="shipping_address[id_country]"] option:selected').val();
    }

    var arr = [];
    arr.push(id_country);
    arr.push(id_address_delivery);
    return arr;
}``

}`