dump-json crashes for specific Twitch URI

[jufius]

First off, thanks for all the work you put into youtube-dl!

I'm using youtube-dl version 2015.10.13, the error however exists in previous versions as well.
When I execute youtube-dl -j http://www.twitch.tv/coestar/profile/past_broadcasts, I get the following error after some elements have been downloaded:

Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/pi/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/home/pi/bin/youtube-dl/youtube_dl/__init__.py", line 410, in main

  File "/home/pi/bin/youtube-dl/youtube_dl/__init__.py", line 400, in _real_main

  File "/home/pi/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1665, in download
  File "/home/pi/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 671, in extract_info
  File "/home/pi/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 832, in process_ie_result
  File "/home/pi/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 724, in process_ie_result
  File "/home/pi/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 660, in extract_info
  File "/home/pi/bin/youtube-dl/youtube_dl/extractor/common.py", line 290, in extract
  File "/home/pi/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 248, in _real_extract
  File "/home/pi/bin/youtube-dl/youtube_dl/extractor/common.py", line 977, in _extract_m3u8_formats
  File "/home/pi/bin/youtube-dl/youtube_dl/utils.py", line 1374, in int_or_none
ValueError: invalid literal for int() with base 10: 'None'

The culprit may be close to a video entry from after 2015-10-05, because before I did not encounter this problem. I suspect it has something to do with the single video entry from 2015-10-06.

As a side note, the videos themselves download without error.