EXC_BAD_ACCESS in SocketIOTransportXHR.m

[sjeast]

I'm getting a crash when I try and connect to a very simple test SocketIO server setup to use XHR (as it will run on Heroku). At the moment I'm just testing locally on my Mac and when I try and connect to the server it crashes as line 243 of SocketIOTransport.m:

if (![message isEqualToString:@"1"]) {
    NSArray *messages = [self packetsFromPayload:message];
    [messages enumerateObjectsUsingBlock:^(NSString *message, NSUInteger idx, BOOL *stop) {
        [delegate onData:message];
    }];
}

I downloaded a Zip of the master today which is what I am using in the project so I asume that is the tip revision.

The server code looks like this:

var port = process.env.PORT || 5000;

var express = require('express');
var http = require('http');
var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);

app.get('/', function(request, response) {
response.send('Running');
});

server.listen(port);

io.configure(function () {
io.set("transports", ["xhr-polling"]);
io.set("polling duration", 10);
});

io.sockets.on('connection', function (socket) {
console.log("Connection made");
});

EDIT - adding more info:

I'm running socket.io 0.9.16

here is the output on the server side:

20:58:42 web.1 | started with pid 76317
20:58:43 web.1 | info: socket.io started
20:58:51 web.1 | debug: client authorized
20:58:51 web.1 | info: handshake authorized -BD1OMQRzZDJCIo8HmHA
20:58:51 web.1 | debug: setting request GET /socket.io/1/xhr-polling/-BD1OMQRzZDJCIo8HmHA?t=1371153531155
20:58:51 web.1 | debug: setting poll timeout
20:58:51 web.1 | debug: client authorized for
20:58:51 web.1 | debug: clearing poll timeout
20:58:51 web.1 | debug: xhr-polling writing 1::
20:58:51 web.1 | debug: set close timeout for client -BD1OMQRzZDJCIo8HmHA
20:58:51 web.1 | Connection made
20:59:51 web.1 | debug: fired close timeout for client -BD1OMQRzZDJCIo8HmHA
20:59:51 web.1 | info: transport end (close timeout)
20:59:51 web.1 | debug: discarding transport

and on the iOS side:

2013-06-13 20:58:51.133 C4Response[76320:c07] Connecting to socket with URL: http://localhost:5000/socket.io/1/?t=16807
2013-06-13 20:58:51.149 C4Response[76320:c07] didReceiveResponse() 200
2013-06-13 20:58:51.149 C4Response[76320:c07] connectionDidFinishLoading() -BD1OMQRzZDJCIo8HmHA:60:60:xhr-polling
2013-06-13 20:58:51.149 C4Response[76320:c07] sid: -BD1OMQRzZDJCIo8HmHA
2013-06-13 20:58:51.153 C4Response[76320:c07] heartbeatTimeout: 67.000000
2013-06-13 20:58:51.154 C4Response[76320:c07] transports: (
"xhr-polling"
)
2013-06-13 20:58:51.154 C4Response[76320:c07] xhr polling supported -> using it now