Tried to change texture pack in-game

What I expected to happen was...:
I used Sphax PureBDcraft so maybe it doesn't reconize some block or so?

What actually happened was...:
I tried to change my regular minecraft tp to Sphax in-game and it crashed.
Steps to Reproduce:
1. Go to survival (not changing any settings for world)
2. Go to settings and hit texture packs, change it to Sphax x126
3. Enjoy your bug...