Hub fails to handle connect request

[archie]

Running:

// to connect in node.js do:
var pubsub = require('pubsub.io').connect('127.0.0.1:9999');

results in the following stacktrace on the hub:

TypeError: Cannot call method 'replace' of undefined
    at sign (/home/archie/tools/pubsub-hub/node_modules/websock/index.js:17:22)
    at Array.forEach (native)
    at sign (/home/archie/tools/pubsub-hub/node_modules/websock/index.js:16:11)
    at handshake0 (/home/archie/tools/pubsub-hub/node_modules/websock/index.js:48:14)
    at exports.onupgrade (/home/archie/tools/pubsub-hub/node_modules/websock/index.js:137:76)
    at Array.router [as 0] (/home/archie/tools/pubsub-hub/node_modules/router/index.js:92:6)
    at find (/home/archie/tools/pubsub-hub/node_modules/router/index.js:33:19)
    at Server.fn (/home/archie/tools/pubsub-hub/node_modules/router/index.js:66:7)
    at Server.EventEmitter.emit (events.js:115:20)
    at Socket.socket.ondata (http.js:1710:14)

Using:

dev ➜ pubsub.io-client node --version
v0.8.9

on:

dev ➜ pubsub.io-client uname -rvpo
3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 GNU/Linux

Any clues as to why this is happening or how it can be solved?

Best regards,
Marcus