Here is the stack trace from the mailmansuite.log.
ERROR 2023-10-04 10:59:03,587 2091 postorius Un-handled exception: HTTP Error 400: invalid literal for int() with base 10: 'oAAAANSUhEUgAACfYAAAiVBORw0KGgoAAAANSUhEUgAACfYAAAYKCAIAAAAQvT9CAAAACXBIWXMAAC4jAAAuIwF4pT92AAAg\r\n' Traceback (most recent call last): File "/opt/mailmanve/lib/python3.9/site-packages/django/core/handlers/base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/opt/mailmanve/lib/python3.9/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view return view_func(request, *args, **kwargs) File "/opt/mailmanve/lib/python3.9/site-packages/postorius/auth/decorators.py", line 63, in wrapper return fn(*args, **kwargs) File "/opt/mailmanve/lib/python3.9/site-packages/postorius/views/list.py", line 864, in list_moderation held_messages = paginate( File "/opt/mailmanve/lib/python3.9/site-packages/django_mailman3/lib/paginator.py", line 71, in paginate objects = paginator.page(page_num) File "/opt/mailmanve/lib/python3.9/site-packages/django_mailman3/lib/paginator.py", line 47, in page result = self.function(count=self.per_page, page=number) File "/opt/mailmanve/lib/python3.9/site-packages/mailmanclient/restobjects/mailinglist.py", line 164, in get_held_page return Page(self._connection, url, HeldMessage, count, page) File "/opt/mailmanve/lib/python3.9/site-packages/mailmanclient/restbase/page.py", line 37, in __init__ self._create_page() File "/opt/mailmanve/lib/python3.9/site-packages/mailmanclient/restbase/page.py", line 62, in _create_page response, content = self._connection.call(self._build_url()) File "/opt/mailmanve/lib/python3.9/site-packages/mailmanclient/restbase/connection.py", line 160, in call raise HTTPError(params.get('url'), response.status_code, urllib.error.HTTPError: HTTP Error 400: invalid literal for int() with base 10: 'oAAAANSUhEUgAACfYAAAiVBORw0KGgoAAAANSUhEUgAACfYAAAYKCAIAAAAQvT9CAAAACXBIWXMAAC4jAAAuIwF4pT92AAAg\r\n'