Give option getToken: null, but dont get error back

[huskylin]

const jwtAuth = expressJwt({
  secret: 'secretkey',
  credentialsRequired: false,
  getToken: function fromHeaderOrCookies (req) {
    if (req.headers.authorization && req.headers.authorization.split(' ')[0] === 'Bearer') {
      return req.headers.authorization.split(' ')[1];
    } else if (req.cookies.JWT) {
      return req.cookies.JWT;
    }
    return null;
  }
}).unless({ path: ['/login']});

I copy example code and edit it to a "cookie version"
If browser have cookie, it will check and perfectly works.
If I delete cookie from the browser, it should return error but it doesn't.

It means: i give getToken a null value, it doesn't give a error back.
Where did I go wrong?

[huskylin]

Ohhhh, I got it
Cuz I set credentialsRequired = false
so it wont show error
But I feel a little weird that "no token will be fine, but wrong token will get error".