private function checkArgumentItself(?string $tagContent = null): void
    {
        if (!$this->getArgumentTokenOfTag()) {
            throw (new CodeError(
                static::CODE_TAG_MISSING_VARIABLE,
                self::MESSAGE_TAG_MISSING_VARIABLE,
                $this->stackPos
            ))
                ->setPayload([$tagContent])
                ->setToken($this->token);
        }
    }