exit hook

function cals_webforms_exit($destination = NULL) {
  if (arg(0) == 'system' && arg(1) == 'ajax') {
    $is_user_webform_submission = isset($_POST) && isset($_POST['form_build_id']) && isset($_POST['form_token']);
    if ($is_user_webform_submission && user_is_anonymous()) {
      $form_build_id = $_POST['form_build_id'];
      $form_id = $_POST['form_id'];
      $form_state = form_state_defaults();
      $form_state['values'] = $_POST; // Important!
      $form = form_get_cache($form_build_id, $form_state);
      if (!$form) {
        watchdog(__FUNCTION__, 'AJAX form submission failed. Trying again...', array(), WATCHDOG_WARNING);
        $form = drupal_rebuild_form($form_id, $form_state);
        $form['#build_id_old'] = $form['#build_id']; // Important!
        // Try form submission again after it is rebuilt above
        $commands[] = ajax_command_update_build_id($form);
        $commands[] = ajax_command_invoke('form', 'click', array('submit'));
        print ajax_render($commands);
    }
    }

  }
}