RS if the container of a single page is null

2014-06-10 08:28:59,653 [ajp-apr-8005-exec-52] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N5-E16 ^%^ org.olat.core.logging 
Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; MALC; rv:11.0) like Gecko ^%^ 
**RedScreen**
<dispatchinfo>
	<componentinfo>
		<compname>command.edit</compname>
		<compclass>org.olat.core.gui.components.link.Link</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>command.edit</command>
			<tostring>com:command.edit,org.olat.core.gui.control.Event@71e09eec</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.commons.modules.singlepage.SinglePageController</controllername>
		<controllername>org.olat.course.nodes.sp.SPRunController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.controller.simple.SimpleBaseController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.BaseChiefController</controllername>
	</controllerinfo>
</dispatchinfo>
>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:115)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:516)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:228)
   at org.olat.core.gui.components.Component.dispatchRequest(Component.java:192)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:241)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:197)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:268)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:197)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.core.commons.modules.singlepage.SinglePageController.event(SinglePageController.java:349)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:195)
   at org.olat.core.gui.components.Component$1.run(Component.java:238)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.Component.fireEvent(Component.java:236)
   at org.olat.core.gui.components.link.Link.dispatch(Link.java:188)
   at org.olat.core.gui.components.link.Link.doDispatchRequest(Link.java:175)
   at org.olat.core.gui.components.Component.dispatchRequest(Component.java:192)
   at org.olat.core.gui.components.Window.doDispatchToComponent(Window.java:1145)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:337)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:228)