Undefined index: state in Drupal\content_moderation

I have notice in log: "Undefined index: state in Drupal\content_moderation\Plugin\Field\FieldWidget\ModerationStateWidget::validateElement() (line 171 of /var/www/html/docroot/core/modules/content_moderation/src/Plugin/Field/FieldWidget/ModerationStateWidget.php).". Moderation status works well, but after click on button this message is logged. It is called by validation function.