Node Webkit program crashes with nwdirectory

I'm trying to create a directory selection dialog in my node webkit program.

According to the documentation I just have to add nwdirectory to my file dialog.

Every time I use the file dialog, after selecting a folder and clicking ok, my program will hang for a few seconds, and then exit without any error messages.

I've attempted to use the webkit flag webkitdirectory, as well, with the same result.

I append the locator to my settings window using jQuery:

settings.append($('<input style="display:none;" id="fileDialog" nwdirectory type="file"/>'));
settings.append($('<span class="saveLoc">'+ options['savelocation'] +'</span>'));

and I bind it using the function from the documentation:

function chooseFile(name) {
  var chooser = $(name);
  chooser.change(function(evt) {
    console.log($(this).val());
  });
  chooser.trigger('click');
}
settings.find('.saveLoc').click(function(){
  chooseFile('#fileDialog');
});

The code works if I remove the nwdirectory flag, but then the user can only select files, not folders.

Am I making a mistake? And if not, is there any way for me to extract information about the cause of the crash?

Thanks!