Good Evening,
I'm getting reports of people trolling my players by asking them for tpahere and moving into Portal blocks, trapping them and forcing to ALT+F4 Minecraft.

Since I find this useful to everyone, both if they have overworld activated or deactivated, I suggest you to add Portal (ID: 90) and End Portal (ID: 119) to the unsafe destination, making the TP either go to the closest safe destination or blocked completely.

Thank you for your work and your understanding.

Bump! More people doing this. It's annoying for both staff and users.
You have to change nickname in order to join again, and this is not possible in Online-mode servers!