ZMQ bug (failing script)

gistfile1.js

var util = require("util"),
    zmq = require("zmq"),
    events = require("events");

function Socket(zmqSocket) {
    var self = this;
    self._zmqSocket = zmqSocket;

    self._zmqSocket.on("error", function(error) {
        self.emit("error", error);
    });

    self._zmqSocket.on("message", function(envelope, _, msg) {
        self.emit("message", envelope, msg.toString());
    });
}

util.inherits(Socket, events.EventEmitter);

Socket.prototype.send = function(envelope, msg) {
    console
    this._zmqSocket.send([envelope, new Buffer(0), msg]);
};

Socket.prototype.bind = function(endpoint) {
    this._zmqSocket.bindSync(endpoint);
}

var socket = new Socket(zmq.socket("xrep"));
socket.bind("ipc:///tmp/zmq-issue");

socket.on("message", function(envelope, name) {
    socket.send(envelope, "Hello, " + name);
});