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Not working when verifying webhook URL on LINE platform

See original GitHub issue

Version of Bottender: "bottender": "^0.14.3", Steps to reproduce:

start the server with any endpoint eg: const server = createServer(bot, { path: '/webhook' });
press the Verify on https://developers.line.me/console after changed a new webhook URL
a mock message will be sent from LINE to our server, and it will be something like this eg:

    "events": [
        {
            "replyToken": "00000000000000000000000000000000",
            "type": "message",
            "timestamp": 1512777897980,
            "source": {
                "type": "user",
                "userId": "Udeadbeefdeadbeefdeadbeefdeadbeef"
            },
            "message": {
                "id": "100001",
                "type": "text",
                "text": "Hello, world"
            }
        },
        {
            "replyToken": "ffffffffffffffffffffffffffffffff",
            "type": "message",
            "timestamp": 1512777897980,
            "source": {
                "type": "user",
                "userId": "Udeadbeefdeadbeefdeadbeefdeadbeef"
            },
            "message": {
                "id": "100002",
                "type": "sticker",
                "packageId": "1",
                "stickerId": "1"
            }
        }
    ]
}

internal/process/warning.js:18 (node:16291) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): Error: LINE API - Not found this error will be logged, and it is due to the unhandled promise rejection in lib/express/createMiddleware.js:12

Is this a bug or a behavior? If it is a behavior, how can I handle the promise rejection?