Demon Form crashes the game 100% of the time i hit the button

I completed my 4th ascendancy and took demon form as a minion infernalist.

When i allocated my point in my ascendancy tree on demon form, my game crashed to desktop.

when i hit my demon form button, the game also crashes to desktop 100% of the time.

and when i login and my hp gets to 1 and i revert to human form, my game also crashes to desktop 100% of the time..

so, no using demon form at all. pretty bad bug hehe