NullPointerException on Game Creation

First off, let me say that this is an incredible piece of work. I've been lurking around the DOTP2014 section for a while, but this is even better...which is why it annoyed me so much when it started crashing.
Basically, whenever I attempt to start a game it throws a null pointer exception, and the client appears to be the deck editor screen instead a match. I think this *may* be traced back to the fact that I wasn't sure how to exit the deck editor, so I simply saved and then restarted the program. It *seems* to have been crashing ever since then. (Before then I was able to play matches fine)
Basically, whenever I attempt to start a game it throws a null pointer exception, and the client appears to be the deck editor screen instead a match. I think this *may* be traced back to the fact that I wasn't sure how to exit the deck editor, so I simply saved and then restarted the program. It *seems* to have been crashing ever since then. (Before then I was able to play matches fine)
- NullPointerException | Open