WTF bug?! Lunar Revel Diana causes crash and coruption of game files

i was playing with a friend and a couple of his friends and about the 3rd match we played a diana was chosen on the other team and during loading it showed the player using the Lunar Revel skin then crashed my client saying "couldnt find item: Diana" then when i rebooted my League client it reported corrupted game files ... i'm currently doing a check and waiting to get back into game :|