Download of multiple select options with key of 0 shows always checked

Must be something wrong in this part of /webform/components/select.inc at line 819 in the case the key is 0 and there is only 1 item in multiple.

/**
 * Implements _webform_csv_data_component().
 */
function _webform_csv_data_select($component, $export_options, $value) {
  $options = _webform_select_options($component, TRUE);
  $return = array();

  if ($component['extra']['multiple']) {
    foreach ($options as $key => $item) {
      $index = array_search($key, (array) $value);
      if ($index !== FALSE) {
        if ($export_options['select_format'] == 'separate') {
          $return[] = 'X';
        }
        else {
          $return[] = $export_options['select_keys'] ? $key : $item;
        }
        unset($value[$index]);
      }
      elseif ($export_options['select_format'] == 'separate') {
        $return[] = '';
      }
    }

Thanks a lot, I tested it and it indeed solves the problem.