View file upload/src/addons/XenCentral/Feedback/Admin/Controller/User.php

<?php
/**
 * @package XenCentral Feedback System
 * @author DNF Technology
 * @copyright Drnoyan & Nalyan LDA, Portugal, EU
 * @license http://dnf.technology/terms/
 * @link http://customers.dnf.technology
 * @version 2.0.0 Beta 10
 * @revision 12
 */

namespace XenCentral\Feedback\Admin\Controller;

use XF\Admin\Controller\AbstractController;
use XF\Db\Exception;
use XF\Mvc\FormAction;
use XF\Mvc\ParameterBag;

class User extends XFCP_User
{
    public function actionDelete(ParameterBag $params) {
        $user = $this->assertUserExists($params->user_id);

        $userWriter = \XF::em()->find('XenCentral\Feedback:FeedbackUser', [
            'user_id' => $user->user_id
        ]);

        if($userWriter) {
            $this->assertCanEditUser($user);

            if ($this->isPost()) {
                if ($user->is_super_admin) {
                    if (!\XF::visitor()->authenticate($this->filter('visitor_password', 'str'))) {
                        return $this->error(\XF::phrase('your_existing_password_is_not_correct'));
                    }
                }

                $userWriter->delete();

                \XF::repository('XenCentral\Feedback:User')->rebuildFbUsers(0, 1000000);
            }
        }

        return parent::actionDelete($params);
    }
}