Steps to reproduce (for Android mobile app):
* select training
* solve puzzle
* click on puzzle number to view game associated with it
* go through moves of the game
* click on return arrow on top left
Here the app will crash, with some pieces shown overlaid on the board.
* select training
* solve puzzle
* click on puzzle number to view game associated with it
* go through moves of the game
* click on return arrow on top left
Here the app will crash, with some pieces shown overlaid on the board.