From time to time I see the following error in the logs:
TypeError: Drupal\Core\Field\WidgetBase::getWidgetState(): Argument #1 ($parents) must be of type array, null given, called in /app/docroot/modules/contrib/multiple_fields_remove_button/multiple_fields_remove_button.module on line 38 in Drupal\Core\Field\WidgetBase::getWidgetState() (line 600 of /app/docroot/core/lib/Drupal/Core/Field/WidgetBase.php)
I am not sure how to reproduce it, I assume it is related to the us of Autosave Form → .
Ensure value is set for $field_name and $parents in multiple_fields_remove_button_submit_handler.
Active
2.2
Code
Ran into this same issue on my end as well; not sure what's triggering it. Attached is an altered version of the patch that works with PHP 8.1