Uncaught Exception: undefined:undefined

[mh4ck]

Hi, i've implemented everything like it is described in the readme and added my filter this way:

.filter({
    urls: ['*'],
  },
  function (details, cb) {
    let blockTypes = ['mp4', 'webm', 'weba', 'jpg', 'png', 'gif', 'jpeg'];
    if (blockTypes.indexOf(details.type) !== -1) {
      return cb({ cancel: true });
    }
    return cb({ cancel: false });
})

Everytime i want to open a nightmare instance it throws an alert with the message: "Uncaught Exception: undefined:undefined"
and closing the browser directly.

It's definitly from the filter function. When i comment it out the error doesn't appear.
Maybe there are some problems with the latest nightmare version?