[MM3-users] [Django] ERROR (EXTERNAL IP): Internal Server Error: /mailman3/lists/test2.***/settings/message_acceptance MultipleObjectsReturned .. get() returned more than one EmailAddress -- it returned 2!

[Django] ERROR (EXTERNAL IP): Internal Server Error: /mailman3/lists/test2.av-huette.de/settings/message_acceptance Full error stack (redacted) see https://dpaste.com/CEFXPNP67.txt

Internal Server Error: /mailman3/lists/test2.*****/settings/message_acceptance

As far as I remember, I removed every member of that test2 list. I think, my bug report could be of interest to fix a (probably) lurking bug. Everything works here, but last week I had this error