I have one advanture mod and when I was teleport from the nether to the world, I relize to its all around me w wall which I made it on creative. 

**I was try too change mod, but bcs I am standing inside frame of the portal I cant open chat or press F3+F4.

Steps to Reproduce:
1. I make a nether portal on creative and surround with the wall
2. go to the nether
3. change mod to advanture

4.go back to the our world

5. get stuck in the nether portal

6. now I cant break any block or open chat