IllegalStateException while deleting node from the root in the console

• login in console
• add node nt:unstructured 'test' in root
• save
• delete node test
• save

28.05.2009 14:17:43 WARN [org.hippoecm.frontend.model.JcrItemModel.load():172] failed to load /test
28.05.2009 14:17:43 ERROR [org.hippoecm.frontend.JcrObservationManager$JcrListener.process():657] Error occured when processing event
java.lang.IllegalStateException: No referenceable parent node was found
at org.hippoecm.frontend.model.JcrItemModel.save(JcrItemModel.java:229)
at org.hippoecm.frontend.model.JcrItemModel.equals(JcrItemModel.java:267)
at org.apache.commons.lang.builder.EqualsBuilder.append(EqualsBuilder.java:296)
at org.hippoecm.frontend.model.JcrNodeModel.equals(JcrNodeModel.java:150)
at org.hippoecm.frontend.model.tree.CachedTreeModel.newTreeModelEvent(CachedTreeModel.java:77)
at org.hippoecm.frontend.model.tree.CachedTreeModel.onEvent(CachedTreeModel.java:57)
at org.hippoecm.frontend.model.event.ObservableRegistry$ObservationContext.notifyObservers(ObservableRegistry.java:76)
at org.hippoecm.frontend.model.event.JcrEventListener.onEvent(JcrEventListener.java:62)
at org.hippoecm.frontend.JcrObservationManager$JcrListener.process(JcrObservationManager.java:652)
at org.hippoecm.frontend.JcrObservationManager.processEvents(JcrObservationManager.java:822)
at org.hippoecm.frontend.Home.processEvents(Home.java:146)
at org.hippoecm.frontend.Main$6.processEvents(Main.java:293)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1175)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1252)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1353)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:493)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:355)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:200)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:249)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)