Guest access broken

[arminfelder]

since RC 1.0.0 anonymous write access is broken,
with 1.0.0, when the user clicks on the join button, the following line pops up in the log:
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

with 1.1 and 1.2, I don't even see the messages, only the 3 dots, and the logs shows:
Meteor ➔ publish null -> userId: null , arguments: []
Meteor ➔ method public-settings/get -> userId: null , arguments: []
Meteor ➔ publish userData -> userId: null , arguments: []
Meteor ➔ method loadLocale -> userId: null , arguments: [ 'de' ]

[arminfelder]

seems to be already reported here: #14764