Date-related nozomi.la download error

[UseAfterFree-177]

At least one Nozomi gallery fails to download for me today:

bash$ gallery-dl --verbose --mtime-from-date --write-metadata "https://nozomi.la/tag/abubu-1.html"
[gallery-dl][debug] Version 1.16.0-dev
[gallery-dl][debug] Python 3.8.5 - Linux-5.4.0-54-generic-x86_64-with-glibc2.29
[gallery-dl][debug] requests 2.22.0 - urllib3 1.25.8
[gallery-dl][debug] Starting DownloadJob for 'https://nozomi.la/tag/abubu-1.html'
[nozomi][debug] Using NozomiTagExtractor for 'https://nozomi.la/tag/abubu-1.html'
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): n.nozomi.la:443
[urllib3.connectionpool][debug] https://n.nozomi.la:443 "GET /nozomi/abubu.nozomi HTTP/1.1" 206 256
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): j.nozomi.la:443
[urllib3.connectionpool][debug] https://j.nozomi.la:443 "GET /post/9/98/26938989.json HTTP/1.1" 200 690
[nozomi][debug] Active postprocessor modules: [MtimePP, MetadataPP]
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): i.nozomi.la:443

[...]

[urllib3.connectionpool][debug] https://i.nozomi.la:443 "GET /0/3b/c6aa4262184e17480ffe29a1f30256c8a03d31f54ad21ddfc7e4c6b706fef3b0.jpg HTTP/1.1" 200 58363
./gallery-dl/nozomi/abubu/12029 c6aa426…56c8a03d31f54ad21ddfc7e4c6b706fef3b0.jpg
[urllib3.connectionpool][debug] https://j.nozomi.la:443 "GET /post/7/29/10297.json HTTP/1.1" 200 731
[urllib3.connectionpool][debug] https://i.nozomi.la:443 "GET /5/99/47a48686c30563d738275f090055fe2efe03b17b03a23ab58c9a3a11570a2995.jpg HTTP/1.1" 200 44265
./gallery-dl/nozomi/abubu/10297 47a4868…fe2efe03b17b03a23ab58c9a3a11570a2995.jpg
[urllib3.connectionpool][debug] https://j.nozomi.la:443 "GET /post/9/30/130309.json HTTP/1.1" 200 465
[nozomi][error] An unexpected error occurred: TypeError - unsupported operand type(s) for +: 'NoneType' and 'str'. Please run gallery-dl again with the --verbose flag, copy its output and report this issue on https://github.com/mikf/gallery-dl/issues .
[nozomi][debug] 
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/gallery_dl/job.py", line 68, in run
    for msg in self.extractor:
  File "/usr/local/lib/python3.8/dist-packages/gallery_dl/extractor/nozomi.py", line 55, in items
    post["date"] + ":00", "%Y-%m-%d %H:%M:%S%z")
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

For some reason, (at least) one image in the gallery leaves post["date"] unset, which then makes the download error out. If I remove the --mtime-from-date and --write-metadata flags, the download still fails in the same way.