.evaluate(fn, args) blows up Chromeless

[o0101]

This is a bug report

As per the example on the Demo:

const chromeless = new Chromeless({ remote: true })

const screenshot = await chromeless
  .goto('https://www.graph.cool')
  .scrollTo(0, 2000)
  .evaluate(() => {return void;},[])
  .screenshot()

console.log(screenshot)

await chromeless.end()

But running this yields "Failed to fetch"

And if I run it on my own Lambda I do not get any screenshot.