Broken Strongarm module installation with PHP 8.1

This is a problem in Strongarm module in theme_strongarm_admin_form:

  foreach (element_children($form['name']) as $name) {
    $row = array();
    $row[] = isset($form['revert'][$name]) ? drupal_render($form['revert'][$name]) : '';
    $row[] = drupal_render($form['name'][$name]);
    $row[] = drupal_render($form['storage'][$name]);
    $row[] = drupal_render($form['value'][$name]);
    $rows[] = $row;
  }

$form['name'] is NULL.

Drupal core cannot "babysit" broken code, this needs to be fixed in that module. Thanks.

@andrew.farquharson Thanks for working on this and for your efforts. This was not a problem on earlier PHP versions because TypeErrors were only warnings before and therefore the page was displayed/working (though there were warnings in watchdog as well).

We cannot fix something, that is not broken in Drupal core. The function element_children expects in the first parameter an array (https://api.drupal.org/api/drupal/includes%21common.inc/function/element...). If some module passes NULL or other invalid value, it is not a responsibility of Drupal core to handle this. Modules are responsible when working with Drupal core APIs. So this can be fixed easily on Strongarm side checking the value before passing it to the element_children. Code in Drupal core works as intended.