public function urlAvatarScheme($iUserId = null)
    {
        if (is_null($iUserId)) {
            $iUserId = activeUser('id');
        }

        if (empty($iUserId)) {
            $avatarScheme = $this->urlBlankAvatarScheme();
        } else {
            $oUserModel = Factory::model('User', 'nails/module-auth');
            $user       = $oUserModel->getById($iUserId);
            if (empty($user->profile_img)) {
                $avatarScheme = $this->urlBlankAvatarScheme();
            } else {
                $avatarScheme = $this->urlCropScheme();
            }
        }

        return $avatarScheme;
    }