[MM3-users] Problems with shunted Mails

Hi all,

we currently have a problem sending to an email list. The mailing list is an announcement list and is therefore moderated. The mail also arrives for moderation. However, when the mail is released, it is not delivered, but moved to the shunt queue. The error after an unshunt attempt in the log:

Apr 19 12:31:43 2022 (17967) Uncaught runner exception: 'NoneType' object has no attribute 'email'
Apr 19 12:31:43 2022 (17967) Traceback (most recent call last):
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/core/runner.py", line 176, in _one_iteration
    self._process_one_file(msg, msgdata)
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/core/runner.py", line 269, in _process_one_file
    keepqueued = self._dispose(mlist, msg, msgdata)
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/runners/pipeline.py", line 37, in _dispose
    process(mlist, msg, msgdata, pipeline)
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/core/pipelines.py", line 50, in process
    handler.process(mlist, msg, msgdata)
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/handlers/member_recipients.py", line 84, in process
    for member in mlist.regular_members.members
  File "/opt/mailman/mailman-venv/lib64/python3.6/site-packages/mailman/handlers/member_recipients.py", line 85, in <genexpr>
    if member.delivery_status == DeliveryStatus.enabled)
AttributeError: 'NoneType' object has no attribute 'email'
Apr 19 12:31:43 2022 (17967) SHUNTING: 1650364303.8361175+08bb48ae877019e8a4c9dff8024c1270782fceb3

Any hints how we can solve the problem here?