Перестала работать капча при авторизации

public static function getCaptcha($input_name='code'){
    ob_start();
    $captcha_count = self::getInstance()->captcha_count;
    $input_id = 'kcaptcha' . $captcha_count;
	self::includeTemplateFile('special/captcha.php', array('input_id' => $input_id, 'input_name' => $input_name));
    self::getInstance()->captcha_count += 1;
    return ob_get_clean();
}