Cannot set properties of null (setting 'provider')

I'm getting the following error:

The relevant code block in angularx-social-login.js:

this.providers.forEach((provider, key) => {
                    let promise = provider.getLoginStatus();
                    loginStatusPromises.push(promise);
                    promise
                        .then((user) => {
                        user.provider = key; // Line 201
                        this._user = user;
                        this._authState.next(user);
                        loggedIn = true;
                    })
                        .catch(console.debug);

The issue started to pop up when I switched to using a factory to configure the module:

export function angularxSocialLoginFactory(): SocialAuthServiceConfig {  
  return {
    autoLogin: true,  
    providers: [  
      {
        id: GoogleLoginProvider.PROVIDER_ID,
        provider: new GoogleLoginProvider(AppService.configSettings.googleApi),
      },
      {
        id: FacebookLoginProvider.PROVIDER_ID,
        provider: new FacebookLoginProvider(AppService.configSettings.facebookApi),
      }
    ]
  };
}

providers: [
   ...
   {
     provide: 'SocialAuthServiceConfig',
     useFactory: angularxSocialLoginFactory
   },
   ...
]

This was a needed change in my case, because the application IDs won't be available in compile-time, the application has to be configured differently in each environment our app runs in and the configuration file is fetched with an HTTP query.

The error itself doesn't seem to cause any issues or at least I haven't noticed yet, I can still log in using Facebook or Google.

Can this exception cause problems, is there a way to get rid of it?

abacritt / angularx-social-login

Cannot set properties of null (setting 'provider') #446