Stylus 0.29.0 issues

[jasonfry89]

I am attempting to use bundle-up with the latest version of stylus. Including only .css files works without issue (both with bundling enabled and disabled), but when I attempt to include a .styl file, I get errors. When bundling is disabled, I see that the browser performs the correct GET requests for the stylesheets:

mah.css
/generated/stylesheets

When bundling is enabled, I get a 'Maximum call stack size exceeded' error, and the application fails to start. It also references what looks like a stylus error message:

'Range Error: C:\program files\nodejs\testapp\public\stylesheets\mah.styl:1

1|'

Here is what I am doing in code:

// /app.js
var app = express();

bundleUp(app, __dirname + '/assets', {
staticRoot: __dirname + '/public/',
staticUrlRoot: '/',
bundle: false,
minifyCss: false,
minifyJs: false
});

// /assets.js
module.exports = function (assets) {
assets.root = __dirname;
assets.addCss('/public/stylesheets/style.css');
assets.addCss('/public/stylesheets/mah.styl');
assets.addCss('/styles/mah2.styl');
};

// File structure
/public/stylesheets/style.css
/public/stylesheets/mah.styl
/styles/mah2.styl

Some other useful tidbits:
$ stylus -V
0.29.0

$ express -V
3.0.0rc4

Latest bundle-up version

Thanks!

[Cowboy-coder]

And you are certain that mah.styl is using proper Stylus syntax?