NullPointerException when clicking on node in tree in hippo-ecm-frontend-application

1. Start minimal frontend app ("hippo-ecm-frontend-application")
2. Open in browser (localhost:8082 or whatever you configured)
3. Click on node in tree
4. NPE:

25.09.2007 14:06:39 ERROR [org.apache.wicket.RequestCycle.logRuntimeException():1254]
java.lang.NullPointerException
at org.apache.jackrabbit.uuid.UUID.<init>(UUID.java:119)
at org.apache.jackrabbit.uuid.UUID.fromString(UUID.java:161)
at org.apache.jackrabbit.core.SessionImpl.getNodeByUUID(SessionImpl.java:789)
at org.hippoecm.repository.servicing.ServicingSessionImpl.getNodeByUUID(ServicingSessionImpl.java:192)
at org.hippoecm.repository.servicing.WorkflowManagerImpl.getWorkflowNode(WorkflowManagerImpl.java:75)
at org.hippoecm.repository.servicing.WorkflowManagerImpl.getWorkflowDescriptor(WorkflowManagerImpl.java:123)
at org.hippoecm.frontend.plugins.admin.RootPlugin$1.component(RootPlugin.java:54)
at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:820)
at org.hippoecm.frontend.plugins.admin.RootPlugin.update(RootPlugin.java:48)
at org.hippoecm.frontend.Home.update(Home.java:50)
at org.hippoecm.frontend.plugins.admin.browser.BrowserPlugin$1.onNodeLinkClicked(BrowserPlugin.java:50)
at org.apache.wicket.extensions.markup.html.tree.DefaultAbstractTree$9.onClick(DefaultAbstractTree.java:558)
at org.apache.wicket.extensions.markup.html.tree.DefaultAbstractTree$6.onClick(DefaultAbstractTree.java:490)
at org.apache.wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:65)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:163)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:252)
at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:97)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1031)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1107)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1176)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:499)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:279)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:148)
at org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1807)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:526)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1757)
at org.mortbay.http.HttpServer.service(HttpServer.java:879)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:789)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:331)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:520)

at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:520)