[Pkg-mailman-hackers] Bug#904520: python-django-hyperkitty: Deleting thread causes Server Error (500)

[Stephen Paul Weber]

Package: python-django-hyperkitty
Version: 1.1.4-4~bpo9+2
Severity: normal

Dear Maintainer,

As a superuser on the Django app, going to /mailman3/hyperkitty/list/.../thread/.../ there is a "Delete this thread" option in the right-hand sidebar.  Clicking this option results in a page that says Server Error (500) which can only be got rid of by issuing

	sudo systemctl restart mailman3-web

After which the application works as expected again (and the thread is indeed deleted).

-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages python-django-hyperkitty depends on:
ii  fonts-font-awesome          4.7.0~dfsg-1
ii  libjs-bootstrap             3.3.7+dfsg-2
ii  python                      2.7.13-2
ii  python-cssmin               0.2.0-4
ii  python-dateutil             2.5.3-2
ii  python-django               1:1.11.14-1~bpo9+1
ii  python-django-compressor    2.1-1
ii  python-django-extensions    1.7.4-1
ii  python-django-gravatar2     1.4.0-1
ii  python-django-haystack      2.5.1-1
ii  python-django-mailman3      1.1.0-4~bpo9+1
ii  python-django-paintstore    0.2-2~bpo9+2
ii  python-django-q             0.8.1-1~bpo9+1
ii  python-djangorestframework  3.4.0-2
ii  python-enum34               1.1.6-1
ii  python-lockfile             1:0.12.2-2
ii  python-mailmanclient        3.1.1-5~bpo9+1
ii  python-networkx             1.11-2
ii  python-rjsmin               1.0.12+dfsg1-4
ii  python-robot-detection      0.4.0-1~bpo9+1
ii  python-tz                   2016.7-0.3

Versions of packages python-django-hyperkitty recommends:
ii  mailman3-web  0+20170523-14~bpo9+1

python-django-hyperkitty suggests no packages.

-- no debconf information