Undefined error when trying to login an oauth user with email

[davidruisinger]

Environment Setup

Backend: Parse Server 2.2.6
Frontend Web App: Parse JS SDK 1.8.1

Steps to reproduce

1. Login to parse using one of the 3rd party oauth providers
2. Check DB => New user with oauth data is created
3. Add an username/email (in my case they are equal) to that oauth user (Note: I do NOT have a password set for the user)
4. Logout
5. Try to login using the username/email that just has been added to the oauth user
   => Getting an undefined error since that user has NO password (which was on purpose)

Expected behavior:
=> Getting an error that tells me that this user has no password so that I can handle that error in my front end code.

Logs/Trace

Parse Server VerboseMode output (multiple times the same error):

verbose: GET /api/login { host: '192.168.0.132:1337',
  'content-type': 'text/plain',
  origin: 'file://',
  connection: 'keep-alive',
  accept: '*/*',
  'user-agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 9_3_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13E238 (5751683120)',
  'accept-language': 'de-de',
  'accept-encoding': 'gzip, deflate',
  'content-length': '221' } {
  "username": "MY_EMAIL",
  "password": "MY_PASSWORD"
}
verbose: error: Incorrect arguments
error: Uncaught internal server error. Incorrect arguments undefined

[flovilmart]

In order to let an Oauth authenticated user to login with a password, you'd have to set username and Password properties on the user. Did you do that?

[davidruisinger]

No, I "only" have added the email/username (are equal in my case) to the user but NO password. I'm totally aware that the user should not be able to login but I just wanted to note that that case is not properly handled by any error. If a user who has NOT set up a password yet (but has an username/email) tries to login I would expect to get an error that I can handle in my fronted to make the user aware of the issue. So far I can't really handle the error...

(I updated the OP to be more specific)