Login Error After Exceeding Flood Control Attempts

Problem/Motivation

After exceeding the flood control login attempts, the login form displays the following error:
"Error: Call to a member function getAccountName() on null in Drupal\email_tfa\Form\EmailTfaLoginForm->emailTfaLoginFormRedirect()"

Steps to reproduce

1. Enable the email_tfa module.
2. Attempt to log in to the site with incorrect credentials more than 5 times (depending on the user_limit attempts you have configured).

Proposed resolution

Check the $form_state->get('uid') flag within the emailTfaLoginFormRedirect method, similar to how it's handled in the parent submitForm method.