ToDo plugin error renders CMS unusable

The CMS returns just a 500 error page when this happens:

21.10.2009 15:34:27 ERROR [org.apache.wicket.RequestCycle.logRuntimeException():1437] Error attaching this container for rendering: [MarkupContainer [Component id = extension.todo]]
org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [MarkupContainer [Component id = extension.todo]]
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1601)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.hippoecm.frontend.plugins.standards.tabs.TabbedPanel.onBeforeRender(TabbedPanel.java:245)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
at org.apache.wicket.Component.onBeforeRender(Component.java:3682)
at org.apache.wicket.Page.onBeforeRender(Page.java:1426)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.Component.prepareForRender(Component.java:2160)
at org.apache.wicket.Page.renderPage(Page.java:883)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:231)
at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:104)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1181)
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.Http11AprProcessor.process(Http11AprProcessor.java:857)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: A child with id 'request' already exists:
[MarkupContainer [Component id = 2]]
at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:143)
at org.hippoecm.frontend.plugins.cms.dashboard.todo.TodoPlugin$TodoView.populateItem(TodoPlugin.java:110)
at org.apache.wicket.markup.repeater.RefreshingView$1.newItem(RefreshingView.java:108)
at org.apache.wicket.markup.repeater.DefaultItemReuseStrategy$1.next(DefaultItemReuseStrategy.java:78)
at org.apache.wicket.markup.repeater.RefreshingView.addItems(RefreshingView.java:182)
at org.apache.wicket.markup.repeater.RefreshingView.onPopulate(RefreshingView.java:93)
at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:127)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1002)
at org.apache.wicket.Component.beforeRender(Component.java:1034)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1589)
... 54 more