Bug: ERROR TypeError: Cannot read property 'photoURL' of null

[AnthonyNahas]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions

latest

Repro steps

1. sign in
2. sign out
3. an error will be logged

The log given by the failure

ERROR TypeError: Cannot read property 'photoURL' of null
    at AuthProcessService$$1.push.../dist/esm5/ngx-auth-firebaseui.es5.js.AuthProcessService$$1.getUserPhotoUrl

Desired functionality

no error logs