Penthouse error blocks generating file

Hi, I get following error where I sadly have no idea where the problem is:

Unhandled rejection TypeError: Bad argument
    at TypeError (native)
    at ChildProcess.spawn (internal/child_process.js:289:26)
    at exports.spawn (child_process.js:380:9)
    at generateCriticalCss (/Users/nils/repos/schoenwaldnils/blog/node_modules/penthouse/lib/index.js:95:10)
    at process._tickCallback (internal/process/next_tick.js:103:7)

I use jekyll and generate the site to _site where the index.html lies. I try to generate the main-critical.css.

My gulp task:

gulp.task('critical', function (cb) {
  critical.generate({
    inline: false,
    base: '_site',
    src: 'index.html',
    dest: 'build/main-critical.css',
    width: 320,
    height: 480,
    minify: true,
  });
});

[bezoerb]

@pocketjoso Thanks for your work!

[pocketjoso]

Regarding the install error, I just fixed a (new) bug with the missing config.json file in 0.11.11 - so if you re-install criticial/penthouse you should get the fix for this problem.