I don't know if this is happening with built portals but twice now I've accidentally clicked rename while fooling around with my spawned in portals and gotten this crash:

crash-2019-06-02_11.10.00-server.txt

My suggested solution would be to force name spawn portals based on the coordinates they spawn at, perhaps with a creative mode ability to give it a display name for server administrators. This also would make sure that multiple creative portals spawning with the same name via a mod like Recurrent Complex can't cause some other naming issues.

I haven't run into THAT but I have run into a case where the Void Island Control mod randomly decided to spawn my special spawn area island as a player island. I'm going to look into that issue with Bartz next. lol