java.lang.NullPointerException
   at org.netbeans.modules.web.jsf.navigation.PageFlowView.saveLocations(PageFlowView.java:439)
   at org.netbeans.modules.web.jsf.navigation.PageFlowView.serializeNodeLocations(PageFlowView.java:863)
   at org.netbeans.modules.web.jsf.navigation.PageFlowElement$1.run(PageFlowElement.java:168)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:169)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)