Jul 24 18:54:35 2020 (17926) Uncaught runner exception: Multiple rows were found for one_or_none()
Jul 24 18:54:35 2020 (17926) Traceback (most recent call last):
  File "/var/lib/mailman/mailman/src/mailman/core/runner.py", line 173, in _one_iteration
    self._process_one_file(msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/core/runner.py", line 266, in _process_one_file
    keepqueued = self._dispose(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/runners/outgoing.py", line 93, in _dispose
    self._func(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/mta/deliver.py", line 86, in deliver
    refused = agent.deliver(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/mta/bulk.py", line 100, in deliver
    self.decorate(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/mta/decorating.py", line 32, in decorate
    decorator.process(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/handlers/decorate.py", line 264, in process
    process(mlist, msg, msgdata)
  File "/var/lib/mailman/mailman/src/mailman/handlers/decorate.py", line 73, in process
    for archiver in IListArchiverSet(mlist).archivers:
  File "/var/lib/mailman/venv3/lib/python3.6/site-packages/zope.component-4.6-py3.6.egg/zope/component/_api.py", line 141, in adapter_hook
    return sitemanager.queryAdapter(object, interface, name, default)
  File "/var/lib/mailman/venv3/lib/python3.6/site-packages/zope.interface-4.7.1-py3.6-linux-x86_64.egg/zope/interface/registry.py", line 348, in queryAdapter
    return self.adapters.queryAdapter(object, interface, name, default)
  File "/var/lib/mailman/mailman/src/mailman/database/transaction.py", line 85, in wrapper
    return function(args[0], config.db.store, *args[1:], **kws)
  File "/var/lib/mailman/mailman/src/mailman/model/mailinglist.py", line 619, in __init__
    ListArchiver.name == archiver_name).one_or_none()
  File "/var/lib/mailman/venv3/lib64/python3.6/site-packages/SQLAlchemy-1.3.13-py3.6-linux-x86_64.egg/sqlalchemy/orm/query.py", line 3325, in one_or_none
    "Multiple rows were found for one_or_none()"
sqlalchemy.orm.exc.MultipleResultsFound: Multiple rows were found for one_or_none()
Jul 24 18:54:35 2020 (17926) SHUNTING: 1595597075.93013+0b3cad4085c309df51fca229a908645840bac909