Sendgrid-nodejs: UnhandledPromiseRejectionWarning：エラー：不正なリクエスト

次のエラーが発生します。

(node:1475) UnhandledPromiseRejectionWarning: Error: Bad Request
    at Request.http [as _callback] (node_modules/@sendgrid/client/src/classes/client.js:124:25)
    at Request.self.callback (node_modules/request/request.js:185:22)
    at Request.emit (events.js:182:13)
    at Request.<anonymous> (node_modules/request/request.js:1161:10)
    at Request.emit (events.js:182:13)
    at IncomingMessage.<anonymous> (node_modules/request/request.js:1083:12)
    at Object.onceWrapper (events.js:273:13)
    at IncomingMessage.emit (events.js:187:15)
    at endReadableNT (_stream_readable.js:1094:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)
(node:1475) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:1475) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

私のコードは、nextjsアプリの一部としてExpressとノードにあります：

const express = require('express')
const next = require('next')
const bodyParser = require('body-parser')
const sgMail = require('@sendgrid/mail');

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

sgMail.setApiKey(myKey);

const send = ({ email, name, text }) => {
  const message = {
    to: '[email protected]',
    from: email,
    subject: 'New message from',
    text: text,
  }

  return new Promise((resolve, reject) => {
    sgMail.send(message, (error, info) =>
      error ? reject(error) : resolve(info)
    )
  })
}

app.prepare().then(() => {
  const server = express()

  server.use(bodyParser.json())

  server.get('*', (req, res) => {
    return handle(req, res)
  })

  server.post('/api/contact', (req, res) => {
    const { email, name, message } = req.body
    send(email, name, message)
    res.send('success')
  })

  server.listen(3000, (err) => {
    if (err) throw err
    console.log('> Read on http://localhost:3000')
  })
})

• sendgrid-nodejsバージョン：マスター（最新のコミット：[コミット番号]）
  "@ sendgrid / mail"： "^ 6.3.1"、
• Node.jsバージョン：v10.14.2