#vulnerable code 
                             @Override
	public UIViewRoot restoreView(FacesContext context, String viewId) {
		if (isUnloadRequest(context)) {
			UIViewRoot createdView = createView(context, viewId);
			createdView.restoreViewScopeState(context, getRenderKit(context).getResponseStateManager().getState(context, viewId));
			BeanManager.INSTANCE.getReference(ViewScopeManager.class).preDestroyView();
			responseComplete();
			return createdView;
		}

		UIViewRoot restoredView = super.restoreView(context, viewId);

		if (!(isRestorableViewEnabled(context) && restoredView == null && context.isPostback())) {
			return restoredView;
		}

		try {
			UIViewRoot createdView = buildView(viewId);
			return isRestorableView(createdView) ? createdView : null;
		}
		catch (IOException e) {
			throw new FacesException(e);
		}
	} 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	public UIViewRoot restoreView(FacesContext context, String viewId) {
		if (isUnloadRequest(context)) {
			UIViewRoot createdView = createView(context, viewId);
			createdView.restoreViewScopeState(context, getRenderKit(context).getResponseStateManager().getState(context, viewId));
			getReference(ViewScopeManager.class).preDestroyView();
			responseComplete();
			return createdView;
		}

		UIViewRoot restoredView = super.restoreView(context, viewId);

		if (!(isRestorableViewEnabled(context) && restoredView == null && context.isPostback())) {
			return restoredView;
		}

		try {
			UIViewRoot createdView = buildView(viewId);
			return isRestorableView(createdView) ? createdView : null;
		}
		catch (IOException e) {
			throw new FacesException(e);
		}
	}