I created a portal and was thrown inside umberstone.

Mods: Erebus 1.0.28, Forge 14.23.5.2768.
No other mods installed whatsoever

Steps to reproduce:

1. make a world with this seed:
   
   for copy-paste: 5096428351312394144
2. Climb to the nearby hill and make a portal like so:
   
3. Enter, you'll get thrown in umberstone and start suffocating

Would probably be fixed if a return portal was created (see #663) and cleared out an area around where it spawned to ensure this did not happen.

Fixed in dev (finally \o/ ) - will be solved in next release.