Crash on "Save and Exit"

Having loaded an old world, when I chose to Save and Exit, the game crashed to the Android home screen.
I tried restarting/reloading the world and Exit and Save more than 10 times with the same result.

I Then tried creating a new world with same seed (1408106526) in 1.1. This world saved sucessfully once but after exiting/opening several times, this world also crashes consitently when I try to Save and Exit.