pasring error in oauth callback handling

[DeltaByte]

Describe the bug
Error handling auth response. TypeError: Cannot read property 'substr' of null

To Reproduce

1. set up Cognito User Pool with facebook as identity provider
2. call Auth.federatedSignIn({ provider: 'Facebook' })
3. go through oauth flow until you get redirected back to your application

Expected behavior
SDK makes call out to Cognito to complete the auth flow, using the code query parameter from the callback

Screenshots

What is Configured?

Auth.configure({
  // REQUIRED - Amazon Cognito Region
  region: process.env.AMPLIFY_AUTH_REGION,

  // OPTIONAL - Amazon Cognito User Pool ID
  userPoolId: process.env.AMPLIFY_AUTH_POOL_ID,

  // OPTIONAL - Amazon Cognito Web Client ID (26-char alphanumeric string)
  userPoolWebClientId: process.env.AMPLIFY_AUTH_CLIENT_ID,

  oauth: {
    domain: process.env.AMPLIFY_OAUTH_DOMAIN,
    // scope: ['phone', 'email', 'profile', 'openid', 'aws.cognito.signin.user.admin'],
    redirectSignIn: 'http://localhost:3000/oauth2',
    redirectSignOut: 'http://localhost:3000/oauth2'
    // responseType: 'code' // or 'token', note that REFRESH token will only be generated when the responseType is code
  }
})

Environment

  System:
    OS: Linux 5.6 Arch Linux
    CPU: (8) x64 Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz
    Memory: 1.24 GB / 3.84 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 12.18.0 - ~/.nvm/versions/node/v12.18.0/bin/node
    npm: 6.14.4 - ~/.nvm/versions/node/v12.18.0/bin/npm
  npmGlobalPackages:
    @cloudflare/wrangler: 1.9.2
    npm: 6.14.4

Additional context

[ERROR] 42:16.970 OAuth - Error handling auth response. TypeError: Cannot read property 'substr' of null
    at OAuth.eval (OAuth.js?1700:190)
    at step (OAuth.js?1700:55)
    at Object.eval [as next] (OAuth.js?1700:36)
    at eval (OAuth.js?1700:30)
    at new Promise (<anonymous>)
    at __awaiter (OAuth.js?1700:26)
    at OAuth._handleImplicitFlow (OAuth.js?1700:186)
    at OAuth.eval (OAuth.js?1700:246)
    at step (OAuth.js?1700:55)
    at Object.eval [as next] (OAuth.js?1700:36)
    at eval (OAuth.js?1700:30)
    at new Promise (<anonymous>)
    at __awaiter (OAuth.js?1700:26)
    at OAuth.handleAuthResponse (OAuth.js?1700:212)
    at AuthClass.eval (Auth.js?bf82:1748)
    at step (Auth.js?bf82:44)
    at Object.eval [as next] (Auth.js?bf82:25)
    at eval (Auth.js?bf82:19)
    at new Promise (<anonymous>)
    at __awaiter (Auth.js?bf82:15)
    at AuthClass._handleAuthResponse (Auth.js?bf82:1710)
    at eval (Auth.js?bf82:204)
    at eval (urlListener.js?b835:17)
    at AuthClass.configure (Auth.js?bf82:198)
    at eval (amplify-auth.js?ff1d:3)
    at Module../src/plugins/amplify-auth.js (app.js:1228)
    at __webpack_require__ (runtime.js:854)
    at fn (runtime.js:151)
    at eval (index.js:40)
    at Module../.nuxt/index.js (app.js:215)
    at __webpack_require__ (runtime.js:854)
    at fn (runtime.js:151)
    at Module.eval (client.js:41)
    at eval (client.js:1156)
    at Module../.nuxt/client.js (app.js:35)
    at __webpack_require__ (runtime.js:854)
    at fn (runtime.js:151)
    at Object.0 (app.js:1253)
    at __webpack_require__ (runtime.js:854)
    at checkDeferredModules (runtime.js:46)
    at Array.webpackJsonpCallback [as push] (runtime.js:33)
    at app.js:1

[github-actions]

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