Error: Call to a member function id() on null in force_password_change_form_alter() (line 106 of modules/contrib/force_password_change/force_password_change.module)

Problem/Motivation

When you need to display Default User form programmatically (for example, in some block on page), it causes the error:
Error: Call to a member function id() on null in force_password_change_form_alter() (line 106 of modules/contrib/force_password_change/force_password_change.module)
Because, it gets an account object from the Route, not from Form State.

Steps to reproduce

1. Install the module and enable it.
2. Create custom block and display User Default form programmatically.

      $formObject = $this->entityTypeManager->getFormObject('user', 'default')->setEntity($user);
      $form = $this->formBuilder->getForm($formObject);

3. Add the block to some custom page, where url not uses User ID.