the problem when we have a form with a field address, we use the form hook and we need to ajax another set of fields in the same form, but we only want to modify the subform, not all forms with an address of field. then the field widget always sends the field address to the validation form, the ajax form definitely doesn't check the validation on the address it will call errorElement. The element in this case is null
TypeError: Drupal\address\Plugin\Field\FieldWidget\AddressDefaultWidget::errorElement(): Argument #1 ($element) must be of type array, null given, called in C:\Users\www\drupal\web\core\lib\Drupal\Core\Field\WidgetBase.php on line 580 in Drupal\address\Plugin\Field\FieldWidget\AddressDefaultWidget->errorElement() (line 188 of C:\Users\www\drupal\web\modules\contrib\address\src\Plugin\Field\FieldWidget\AddressDefaultWidget.php).
Or this error
TypeError: Drupal\Component\Utility\NestedArray::getValue(): Argument #1 ($array) must be of type array, null given, called in C:\Users\www\drupal\web\modules\contrib\address\src\Plugin\Field\FieldWidget\AddressDefaultWidget.php on line 190 in Drupal\Component\Utility\NestedArray::getValue() (line 69 of C:\Users\www\drupal\web\core\lib\Drupal\Component\Utility\NestedArray.php).
This patch will avoid this error. it should check the value before use, avoid undefined key in variable
Needs review
2.0
Code
@lazzyvn
We need either a test or a small form class where the problem can be observed.
Changing status to "needs review" to signal that there is a patch here.
I tested twice on 2 machines and it drives me crazy. Same version, same project but one has an error, the other does not. it never calls the formError.
Environment has an error Drupal 10.2.3, PHP 8.2