The portable teleporter crashes when opening the GUI after teleporting:

http://pastebin.com/Pd4kcdTy

The log is from a development environment using commit 63f751c but also happens while playing a normal game. Note that while I have Industrialcraft 2 installed, this crash is without the quantum suit or any other armor or even inventory item. The first time the GUI loads fine and displays the destinations. After teleporting, if you open the GUI, it displays briefly but the list is empty and the game crashes.

I can't reproduce this on my end. Is this a one-time occurrence or you or does it happen consistently?

This happens very consistently for me. I'll try and upload a video of what's going on...

Don't worry about it, just found and fixed the issue :)

Yup, that fixed it :D