If I try and forward to a page using the XML navigation or using the handleNavigation method I get the following error DOM is null during applyBrowserChanges and Old DOM is null during domDiff calculation.

Below is a copy of my code to check to see if somebody is logged in before accessing any web pages, if they are not display the login page.

package com.abmsoftware.phaseListener;

import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.http.HttpSession;

import com.abmsoftware.backingbean.global.GlobalSettings;

/**
 * Class checks that the user is logged in.
 * @author fryers
 */
public class AccessControlPhaseListener implements PhaseListener
{
/**
* Called after the phase has completed.
* @param event Phase event triggered.
*/
public void afterPhase(PhaseEvent event)
    {
        FacesContext context = event.getFacesContext();
        HttpSession session =
            (HttpSession)context.getExternalContext().getSession(true);
        GlobalSettings globalSettings =
            (GlobalSettings)session.getAttribute("globalSettings");

        if((globalSettings == null || !globalSettings.isLoggedIn()) &&
            !"/login.jsf".equals(context.getViewRoot().getViewId()))
        {
            context.getApplication().getNavigationHandler().handleNavigation(
                context, null, "login");
        }
    }

/**
* Called before the phase has started.
* @param event Phase event triggered.
*/
    public void beforePhase(PhaseEvent event)
    {
    }

    public PhaseId getPhaseId()
    {
        return PhaseId.RESTORE_VIEW;
    }
}