Critical bug in Fallout 4 (Fallout 4)

In the mission where you have together with Nick Valentine to sit in a chair in the house of memories to pull memories of Kellogg, approach the chair, you can sit down and writes me that I can't until there is a fight. But the problem is that I don't know where this fight goes and how to stop it. Checked the whole neighborhood, poperestrelyali all mutaw, raiders, dogs, no battle no and me in a chair not allowed, they say, the battle goes on. Most likely the problem is in flying the rotorcraft of the brotherhood of steel which sound like somewhere flies and shoots somebody. But he does it all the time! I have tried to wait out the time, just moved to the Neighborhood so that God forbid not to fight with anyone but the problem is not solved, probably because of a rotorcraft of the brotherhood of steel. Knock yourself it's not working. How to solve it tell me?