RS select inexistent? event

2014-09-16 11:12:31,588 [ajp-apr-8005-exec-22] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N5-E23 
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
**RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_indexWeekly</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.commons.calendar.ui.events.KalendarGUISelectEvent</class&gt;
			<command>scalevent</command>
			<tostring>com:scalevent,org.olat.commons.calendar.ui.events.KalendarGUISelectEvent@9020811e</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.commons.calendar.ui.WeeklyCalendarController</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:524)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:228)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.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:269)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:198)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.commons.calendar.ui.CalendarDetailsController.formatDate(CalendarDetailsController.java:89)
   at org.olat.commons.calendar.ui.CalendarDetailsController.<init>(CalendarDetailsController.java:77)
   at org.olat.commons.calendar.ui.WeeklyCalendarController.doOpenEventCallout(WeeklyCalendarController.java:563)
   at org.olat.commons.calendar.ui.WeeklyCalendarController.formInnerEvent(WeeklyCalendarController.java:372)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:410)
   at org.olat.commons.calendar.ui.WeeklyCalendarController.event(WeeklyCalendarController.java:410)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:197)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:238)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:236)
   at