TypeError on City class

[koficoud]

Message: Aftab\Sepomex\Entities\City::__construct(): Argument #1 ($id) must be of type int, null given.
PHP: 8.1
Laravel: Laravel Framework 8.83.13

How reproduce?

    /**
     * Get data by zip code.
     *
     * @param SepomexContract $sepomex
     * @param string $postal
     * @return array
     */
    public function postal(SepomexContract $sepomex, string $postal): array
    {
        return $sepomex->getByPostal($postal); // '50360'
    }