Undefined variable type in Captcha Examples

Hello great community,

Problem/Motivation

I got this error when I entered into the Captcha Examples page

Notice: Undefined variable: type in Drupal\captcha\Form\CaptchaExamplesForm->buildChallenge() (line 108 of modules/contrib/captcha/src/Form/CaptchaExamplesForm.php).

  protected function buildChallenge($module, $challenge) {
    return [
      '#type' => 'captcha',
      '#captcha_type' => $module . '/' . $type,
      '#captcha_admin_mode' => TRUE,
    ];
  }

Proposed resolution

$type variable should be replaced with challenge variable

  protected function buildChallenge($module, $challenge) {
    return [
      '#type' => 'captcha',
      '#captcha_type' => $module . '/' . $challenge,
      '#captcha_admin_mode' => TRUE,
    ];
  }

Thanks