fatal error: unexpectedly found nil while unwrapping an Optional value

@IBOutlet var fbLoginView : FBLoginView!


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.fbLoginView.delegate = self
    self.fbLoginView.readPermissions = ["public_profile", "email", "user_friends"]


}
var userlogged: FBGraphUser?=nil


override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
    println("seg")
    if segue.identifier == "mySegueId" {
        let vc: view_profile = segue.destinationViewController as view_profile


        vc.setprofileId(userlogged!)


    }
}

func loginViewShowingLoggedInUser(loginView : FBLoginView!) {
    println("User Logged In")
    println("This is where you perform a segue (and or another view).")


}



func loginViewFetchedUserInfo(loginView : FBLoginView!, user: FBGraphUser){
    userlogged=user




}





func loginViewShowingLoggedOutUser(loginView : FBLoginView!) {


    println("User Logged Out")
}

func loginView(loginView : FBLoginView!, handleError:NSError) {
    println("Error: \(handleError.localizedDescription)")
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBOutlet weak var fbprofilepic: FBProfilePictureView!

override func viewDidLoad() {
    super.viewDidLoad()



}
func setprofileId(var userlogged: FBGraphUser){


    print("userlogged : ")
    println(userlogged.objectID)


    fbprofilepic.profileID=userlogged.objectID

    //ERROR thrown here BAD INSTRUCT.....

    print("fbprofilepic.profileID : ")
    println(fbprofilepic.profileID);


}