NPE thrown by .ListDataTable on destroy

19.05.2009 16:24:01 ERROR [org.hippoecm.frontend.JcrObservationManager$JcrListener.process():592] Error occured when processing event
java.lang.NullPointerException
at org.hippoecm.frontend.plugins.standards.list.datatable.ListDataTable.destroy(ListDataTable.java:98)
at org.hippoecm.frontend.plugins.standards.list.AbstractListingPlugin.onModelChanged(AbstractListingPlugin.java:175)
at org.apache.wicket.Component.modelChanged(Component.java:2105)
at org.hippoecm.frontend.service.render.AbstractRenderService.onEvent(AbstractRenderService.java:219)
at org.hippoecm.frontend.model.event.ObservableRegistry$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:586)
at org.hippoecm.frontend.JcrObservationManager.processEvents(JcrObservationManager.java:754)
at org.hippoecm.frontend.Home.processEvents(Home.java:132)
at org.hippoecm.frontend.Main$6.processEvents(Main.java:289)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1175)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1252)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1353)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:493)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:355)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:200)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)