Several register issues on newest version

Description:

When a user tries to sign in anonymously he/she receives an Internal server error. See the log below.

There are also problems creating regular new accounts, the account is created but the user isn't redirected and can't login either.

Steps to reproduce:

1. Activate anonymous writing
2. Try to talk anonymously in any channel
3. Receive error

Expected behavior:

The user should be able to register a new account or talk anonymously.

Server Setup Information:

• Version of Rocket.Chat Server: 1.0.1
• Operating System: Ubuntu 14.04
• Deployment Method: Docker-compose
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version: v8.11.4
• MongoDB Version: 3.4.20

Additional context

One additional problem is that I can't downgrade to a lower version either, the problem persists on v.1.0.0 and lower versions seems to have stopped working since upgrading.

Relevant logs:

[34mI20190429-18:09:28.721(0)
[34mMeteor ➔ method registerUser -> userId: null , arguments: [ {} ]
[34mI20190429-18:09:28.732(0) Exception while invoking method 'registerUser' TypeError: Cannot read property 'facebook' of undefined at getAvatarSuggestionForUser (app/lib/server/functions/getAvatarSuggestionForUser.js:12:20) at AccountsServer. (server/lib/accounts.js:221:29) at executeBound (/app/bundle/programs/server/npm/node_modules/underscore/underscore.js:762:67)
at AccountsServer.bound [as insertUserDoc] (/app/bundle/programs/server/npm/node_modules/underscore/underscore.js:793:14)
at MethodInvocation.registerUser (server/methods/registerUser.js:22:28) at MethodInvocation.methodsMap.(anonymous function) (app/lib/server/lib/debug.js:73:34)
at MethodInvocation.methodMap.(anonymous function) (packages/rocketchat_monitoring.js:2731:30) at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1767:12) at DDP._CurrentMethodInvocation.withValue (packages/ddp-server/livedata_server.js:719:19) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1304:12) at DDPServer._CurrentWriteFence.withValue (packages/ddp-server/livedata_server.js:717:46) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1304:12) at Promise (packages/ddp-server/livedata_server.js:715:46) at new Promise () at Session.method (packages/ddp-server/livedata_server.js:689:23) at packages/ddp-server/livedata_server.js:559:43

Start with app/lib/server/functions/getAvatarSuggestionForUser.js:12, then trace the registration flow through server/lib/accounts.js:221 and server/methods/registerUser.js:22. Reproduce anonymous writing and regular account creation on the reported setup, and verify that anonymous messages work and newly created users can log in and are redirected correctly.