Can't register 'super+space' in Windows with Electron

index.js

var app = require('app');
var globalShortcut = require('global-shortcut');

app.on('ready', function(){

  var win_space = globalShortcut.register('super+space', function(){
    console.log('This is rubbish!');
  });

  if(!win_space){
    console.log('Why?!');
  }

  globalShortcut.register('super+s', function(){
    console.log('This works fine!');
  });

});