Can not add the same torrent again after adding and destroying it

[yujiahaol68]

What version of WebTorrent?
0.98.19

What operating system and Node.js version?
darwin, node 8.4

What browser and version? (if using WebTorrent in the browser)
electron 1.7.5

What did you expect to happen?
After I use torrent.destroy and client.add use the same torrentId and path again. It can resume the previous download task.

What actually happened?
client.add works in the first time but the second time failed after I have torrent.destroy it
Not any error have been throw and also not any download signal or speed.

[feross]

Duplicate of #1180