getBlob, getBlobURL don't work

[bachlx-bitmark]

What version of WebTorrent?
I use webtorrent version 0.98.18
What browser and version? (if using WebTorrent in the browser)
I use Chrome browser on macOS -version 57.0.2987.133 (64-bit)
What did you expect to happen?
After download done, I create link as you API document:

file.getBlobURL(function (err, url) {
  if (err) throw err
  var a = document.createElement('a')
  a.download = file.name
  a.href = url
  a.textContent = 'Download ' + file.name
  document.body.appendChild(a)
})

What actually happened?
It display an error:

webtorrent.min.js:1 Uncaught TypeError: Cannot read property 'get' of null
    at r._notify (webtorrent.min.js:1)
    at r._read (webtorrent.min.js:1)
    at r.i.read (webtorrent.min.js:6)
    at v (webtorrent.min.js:6)
    at webtorrent.min.js:5
    at c.run (webtorrent.min.js:5)
    at u (webtorrent.min.js:5)

I see in inspect of Chrome:

Note: web client use angular2
Please check help me.
Thanks!

[so010]

It has to be the file object from the torrent which you get from webtorrentClient.add:

webtorrentClient = new WebTorrent()
webtorrentClient.add(magnetURI,function(torrent) {
  torrent.on('done', function () {
      console.log('torrent download finished from ',torrent.files[0].name)
      torrent.files[0].getBlobURL(function callback (err, url) {
        if (err) console.log('Error on getting torrent-file: ',torrent.files[0].name)
        var a = document.createElement('a')
        a.download = torrent.files[0].name
        a.href = url
        a.textContent = 'Download ' + torrent.files[0].name
        document.body.appendChild(a)
      })
    })
    torrent.on('download',function (bytes) {
      console.log('torrent progress: ',torrent.progress,torrent.files[0].name)
    })
})

[bachlx-bitmark]

I found my problem, I have other process stop torrent when I try getBlod().
Thanks!

[lock]

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