InvalidArgumentException: The entity object refers to a removed translation (pt-br) and cannot be manipulated. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 576 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).

Create an ES menu: test-ES
Translate this menu into PT language: test-PT
Enter the /admin/structure/menu/manage/main page
Delete menu: test-PT
Report an error: InvalidArgumentException: The entity object refers to a removed translation (pt-br) and cannot be manipulated. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 576 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).

Will need a test showing the issue.

But typically we need to backtrace more. Just putting an isset or empty check could be masking a larger issue.