Deprecated function: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in webform_form_alter()

That line is:

if (\Drupal::moduleHandler()->moduleExists('config_translation') && preg_match('/^entity.webform.(?:edit|settings|assets|access|handlers|third_party_settings)_form$/', \Drupal::routeMatch()->getRouteName())) {

What is the route name NULL? What are the steps to reproduce this bug?

I tried to reproduce this bug this morning to put them here, but i updated to core 10.3.0 over the weekend and now the warnings are no longer in my dblogs. Not sure if this should be closed or not.

This should be fixed because via CLI \Drupal::routeMatch()->getRouteName() can be equal to NULL

This was fixed via 🐛 When a Webform is loaded on a 404 page: [PHP 8.1] Deprecated function: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in webform_form_alter() Needs review