I am not sure if this something that changed, but I noticed in a duel when you press the back/cancel button to see the permanents I get a type error and the game crashes.
No, it would appear that it only happens when I continue my game from an older version. When I started a new game and looked it crashes. I went back to the shop to challenge one of the other kids and when I went to switch my deck it crashed there too. I am gonna take an educated guess that a card in my deck is the problem