public function getMessage($key = null) {
		$result = [];
		if (empty($key)) {
			return $result;
		}

		$sessionKey = $this->_sessionKey . '.' . $key;
		if (!CakeSession::check($sessionKey)) {
			return $result;
		}

		$data = CakeSession::read($sessionKey);
		if (empty($data)) {
			return $result;
		}

		$result = (array)$data;
		if (isAssoc($result)) {
			$result = [$result];
		}

		return $result;
	}