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VC-Error: isSingleton() of a null object loaded from local variable 'parent'

Hi folks,

some user get this error. Not every time, not on the same place (on any click in the vc-application). Can someone give me an idea how to solve this or where to look like?

Stacktrace:

500 Internal Server Error is returned for HTTP request [https://portal.stadt.essen.de:50000/webdynpro/resources/sap.com/pb/PageBuilder]:

  component [dispatcher],

  web module [webdynpro/resources/sap.com/de.essen.rechnungseingangsbuch_impl],

  application [sap.com/de.essen.rechnungseingangsbuch_impl],

  DC name [sap.com/de.essen.rechnungseingangsbuch_impl],

  CSN component[],

  problem categorization [],

  internal categorization [-773710491].

[EXCEPTION]

java.lang.NullPointerException: while trying to invoke the method com.sap.tc.webdynpro.progmodel.context.NodeInfo.isSingleton() of a null object loaded from local variable 'parent'

at com.sap.tc.webdynpro.progmodel.context.MappedNodeInfo.isSingleton(MappedNodeInfo.java:66)

at com.sap.tc.webdynpro.progmodel.context.Node.getChildNodeInternal(Node.java:980)

at com.sap.tc.webdynpro.progmodel.context.Paths.followPath(Paths.java:1422)

at com.sap.tc.webdynpro.progmodel.context.Paths.followPath(Paths.java:1393)

at com.sap.tc.webdynpro.progmodel.context.Paths.createAttributePointer(Paths.java:175)

at com.sap.tc.webdynpro.progmodel.context.Paths.createAttributePointerExt(Paths.java:190)

at com.sap.tc.webdynpro.clientserver.uielib.standard.impl.AbstractDropDownByKey.getSelectedKey(AbstractDropDownByKey.java:508)

at com.sap.tc.wd4vc.core.std.interactors.pane.Generic.wdDoModifyView(Generic.java:339)

at com.sap.tc.wd4vc.core.std.interactors.pane.wdp.InternalGeneric.wdDoModifyView(InternalGeneric.java:260)

at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doModifyView(DelegatingView.java:94)

at com.sap.tc.webdynpro.progmodel.view.View.modifyView(View.java:746)

at com.sap.tc.webdynpro.progmodel.window.ViewController.modifyView(ViewController.java:254)

at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doModifyView(ClientComponent.java:432)

at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doModifyView(ClientComponent.java:438)

at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doModifyView(ClientComponent.java:438)

at com.sap.tc.webdynpro.clientserver.phases.ModifyViewPhase.execute(ModifyViewPhase.java:69)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequestPartly(WindowPhaseModel.java:162)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doProcessRequest(WindowPhaseModel.java:110)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:97)

at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:515)

at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:58)

at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doExecute(ClientApplication.java:1671)

at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doProcessing(ClientApplication.java:1485)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessingEmbedded(ApplicationSession.java:919)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessing(ApplicationSession.java:878)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:357)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:326)

at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToRequestManager(AbstractExecutionContextDispatcher.java:62)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.service(DispatchHandlerForRequestManager.java:39)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.service(DispatchHandlerForRequestManager.java:46)

at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:270)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToAppContext(ExecutionContextDispatcher.java:68)

at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:53)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:245)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.callRequestManager(JavaApplicationProxy.java:1244)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.callEmbeddedApplication(JavaApplicationProxy.java:1122)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$SendDataAndProcessActionCommand.doExecute(JavaApplicationProxy.java:1605)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$AbstractCommand.execute(JavaApplicationProxy.java:1488)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.execute(JavaApplicationProxy.java:1028)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy.execute(JavaApplicationProxy.java:859)

at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy.sendDataAndProcessAction(JavaApplicationProxy.java:468)

at com.sap.tc.webdynpro.portal.pb.impl.JavaApplicationProxyAdapter.sendDataAndProcessAction(JavaApplicationProxyAdapter.java:191)

at com.sap.portal.pb.PageBuilder.updateApplications(PageBuilder.java:1698)

at com.sap.portal.pb.PageBuilder.SendDataAndProcessAction(PageBuilder.java:369)

at com.sap.portal.pb.PageBuilder$PhaseListenerImpl.doPhase(PageBuilder.java:2123)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processPhaseListener(WindowPhaseModel.java:251)

at com.sap.tc.webdynpro.clientserver.phases.PortalDispatchPhase.execute(PortalDispatchPhase.java:50)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequestPartly(WindowPhaseModel.java:162)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doProcessRequest(WindowPhaseModel.java:110)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:97)

at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:515)

at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:58)

at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doExecute(ClientApplication.java:1671)

at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doProcessing(ClientApplication.java:1485)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessingStandalone(ApplicationSession.java:908)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessing(ApplicationSession.java:880)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:357)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:326)

at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doContent(AbstractDispatcherServlet.java:87)

at com.sap.tc.webdynpro.serverimpl.wdc.DispatcherServlet.doContent(DispatcherServlet.java:89)

at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doPost(AbstractDispatcherServlet.java:62)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:152)

at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:38)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:457)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:210)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:441)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:430)

at com.sap.engine.services.servlets_jsp.filters.DSRWebContainerFilter.process(DSRWebContainerFilter.java:38)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:81)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:278)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:81)

at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)

at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.SessionSizeFilter.process(SessionSizeFilter.java:26)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.MemoryStatisticFilter.process(MemoryStatisticFilter.java:57)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.filters.DSRHttpFilter.process(DSRHttpFilter.java:43)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)

at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:475)

at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.process(Processor.java:269)

at com.sap.engine.services.httpserver.server.rcm.RequestProcessorThread.run(RequestProcessorThread.java:56)

at com.sap.engine.core.thread.execution.Executable.run(Executable.java:122)

at com.sap.engine.core.thread.execution.Executable.run(Executable.java:101)

at com.sap.engine.core.thread.execution.CentralExecutor$SingleThread.run(CentralExecutor.java:328)

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