Widget visibility problem

Hey, I’m using nirvana theme and its good. But the problem is, I’m using BBpress with this theme, and i don’t wanted to show widgets related to posts and any others on forum page. Jetpack’s widget visibility is allowing me to select forum page too, but jetpack’s plugin is overridden by themes widget visibility function. is there any option to disable theme’s widget visibility function?

[ No bumping please. ]