Can not delete a role

I am unable to delete role. following are the steps to reproduce this error.

1. Install module
2. Create a custom role and then try to delete it.

When i debug module, i found a hook, which is no longer needed

function front_page_user_role_delete($role) {
  // Delete Front configuration for the role being deleted.
  Database::getConnection()->delete('front_page')
    ->condition('rid', $role->rid)
    ->execute();
}