[ted] can't download playlist: JSONDecodeError: Expecting property name enclosed in double quotes

[jwilk]

$ youtube-dl -v test:Ted_3
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'test:Ted_3']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.04.24
[debug] Python version 3.5.3 (CPython) - Linux-2.6.32-042stab134.8-x86_64-with-debian-9.8
[debug] exe versions: ffmpeg 3.2.12-1, ffprobe 3.2.12-1
[debug] Proxy map: {}
[TestURL] Test URL: http://www.ted.com/playlists/who_are_the_hackers
[ted] who_are_the_hackers: Downloading playlist webpage
Traceback (most recent call last):
  File "/home/jwilk/.local/bin/youtube-dl", line 11, in <module>
    sys.exit(main())
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/__init__.py", line 474, in main
    _real_main(argv)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 2008, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 807, in extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 868, in process_ie_result
    extra_info=extra_info)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    ie_result = ie.extract(url)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 529, in extract
    ie_result = self._real_extract(url)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/extractor/ted.py", line 146, in _real_extract
    return self._playlist_videos_info(url, name)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/extractor/ted.py", line 153, in _playlist_videos_info
    info = self._extract_info(webpage)
  File "/home/jwilk/.local/lib/python3.5/site-packages/youtube_dl/extractor/ted.py", line 133, in _extract_info
    return json.loads(info_json)
  File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.5/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.5/json/decoder.py", line 355, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 2 column 3 (char 4)