RS if the selected thread in forum doesn't exists

2016-01-12 15:37:27,167 [ajp-nio2-8003-exec-18] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N3-E38 ^%^ org.olat.core.logging 

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/601.3.9 (KHTML, like Gecko) Version/9.0.2 Safari/601.3.9 ^%^ **RedScreen**
<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_threads</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.components.form.flexible.impl.elements.table.SelectionEvent</class&gt;
			<command>select</command>
			<tostring>com:select,org.olat.core.gui.components.form.flexible.impl.elements.table.SelectionEvent@c9ff351b</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.modules.fo.ui.ThreadListController</controllername>
		<controllername>org.olat.modules.fo.ui.ForumController</controllername>
		<controllername>org.olat.course.nodes.fo.FOCourseNodeRunController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.course.run.CourseRuntimeController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   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:536)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:234)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:275)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:216)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:289)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:232)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.modules.fo.ui.ForumController.doThreadView(ForumController.java:259)
   at org.olat.modules.fo.ui.ForumController.doProcessSelectEvent(ForumController.java:248)
   at org.olat.modules.fo.ui.ForumController.event(ForumController.java:205)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:246)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:243)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:190)
   at org.olat.modules.fo.ui.ThreadListController.doSelect(ThreadListController.java:253)
   at org.olat.modules.fo.ui.ThreadListController.formInnerEvent(ThreadListController.java:232)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:408)
   at org.olat.modules.fo.ui.ThreadListController.event(ThreadListController.java:190)