     var saleViewModel: SaleViewModel!
     var appeared = false
 
-    var headerStack: ORStackView!
+    var headerStack: ORStackView?
     var stickyHeader: ScrollingStickyHeaderView!
     var titleView: AuctionTitleView?
 

        let liveCV = ARSwitchBoard.sharedInstance().loadLiveAuction(saleID)

        ARTopMenuViewController.shared().push(liveCV!, animated: true) {
            self.navigationController?.popViewController(animated: false)
        }
    }


        self.networkModel.fetchLotStanding().next { [weak self] lotStandings in
            saleViewModel.updateLotStandings(lotStandings)

            if let existingLotStandingsView = self?.headerStack?.viewWithTag(ViewTags.lotStandings.rawValue) {
                self?.headerStack?.removeSubview(existingLotStandingsView)
            }

            self?.addLotStandings()
