No, I tried to delete and recreate the list, same problem. And same problem with all lists on that domain.
After reinstalling mailman, I have almost the same problem.
Now, there are no errors with virtual-mailman.db. But if I delete a list of this domain, it stays in virtual-mailman. For others domains, no problem.
I have found that web admin/users interfaces are https URLs for the domain mail of this list, and not http URL.
And the links from admin/users interfaces are https URLs, and coded as http URLs.
In mm_cfg.py, there is
DEFAULT_URL_PATTERN = 'http://%s/cgi-bin/mailman/'
And no https directive in <domain>.vhost