Problem with "TypeError: %d format: a number is required, not NoneType" in mdr.py (version 2020.03.08)

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Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.03.08
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

youtube-dl -v "https://www.kika.de/lollywood/sendung119852.html"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.kika.de/lollywood/sendung119852.html']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.03.08
[debug] Python version 3.7.3 (CPython) - Linux-5.0.0-38-generic-x86_64-with-Ubuntu-19.04-disco
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3, rtmpdump 2.4
[debug] Proxy map: {}
[MDR] 119852: Downloading webpage
[MDR] 119852: Downloading XML
Traceback (most recent call last):
  File "/home/pierre/.local/bin/youtube-dl", line 10, in <module>
    sys.exit(main())
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/__init__.py", line 474, in main
    _real_main(argv)
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/YoutubeDL.py", line 2019, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/pierre/.local/lib/python3.7/site-packages/youtube_dl/extractor/mdr.py", line 131, in _real_extract
    'format_id': '%s-%d' % (media_type, vbr or abr),
TypeError: %d format: a number is required, not NoneType