I made red portal and tried travelling to the Nether.
crash-2019-05-24_16.18.11-server.txt

Strange, it looks like the correct teleporter isn't being used, meaning this is probably a compatibility issue. Can I have debug.log?

Can you try again with 1.12.2-1.8.0.2?

That was my fault. Due to an old config alternative teleporter was set to false.