Screen gets dark when an object dissappears(solved)

I am working on a war game. When I send a bullet if the bullet gets out of the scope of camera all the screen gets dark. I can't think about any reason.

I attach it to rootNode ( reach to rootNode by getparent methods). I also add a controller to bullet but there is nothing special in it.

how could it be?

I found, that is because I did not update modelbounds.