Issue with Ultimate membership plugin

Hey, I noticed that the plugin has a compatibility issue with user roles when using the Ultimate Membership plugin. The main reason is $user->roles return array without 0 index. And in code, you very often retrieve a role like this $user->roles[0]
eg:

includes/classes/Authenticator/Login.php:549
if ( 'backup_codes' !== $provider && SettingsPage::are_backup_codes_enabled( $user->roles[0] ) && isset( $codes_remaining ) && $codes_remaining > 0 ) {

includes/classes/Admin/Controllers/class-settings.php:177

if ( null === $role ) {
    $role = $user->roles[0];
}

I temporarily fixed the problem at my site by replacing $user->roles[0] into array_pop($user->roles) but that doesn’t solve the problem globally. I think you should add an util that will get the role regardless of indexes