The game crashes

[NikRetaNCAM]

The title is short, can't think of anything better

I have a FlxTYpedGroup for UI
In this UI group, there is a button, looking and (planned to be) working like a dice.
Upon clicking, it gets a randomized value that defines what bonus will player get
BUT the game crashes upon clicking
Any help?

[NikRetaNCAM]

moving the code to PlayState hepled ._.