ok, lesson learned, turns out we had deleted a user (who had never posted) from the Users table at some point... and in particular there were still entries in ChannelMembers referencing that user ID.
Everything is now working again.
ok, lesson learned, turns out we had deleted a user (who had never posted) from the Users table at some point... and in particular there were still entries in ChannelMembers referencing that user ID.
Everything is now working again.