NPE in course preview if a checkbox is not already published

RedScreen on commolat 9.4.0
2014-05-20 21:02:02,628 [ajp-apr-8002-exec-2] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N2-E23 ^%^ org.olat.core.logging 
Mozilla/5.0 (X11; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0 ^%^ **RedScreen**
<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_run</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo></extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.components.form.flexible.impl.FormEvent</class&gt;
			<command>ONCHANGE</command>
			<tostring>com:ONCHANGE,org.olat.core.gui.components.form.flexible.impl.FormEvent@a30cee6e</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.course.nodes.cl.ui.CheckListRunController</controllername>
		<controllername>org.olat.course.run.preview.PreviewRunController</controllername>
		<controllername>org.olat.course.run.preview.PreviewConfigController</controllername>
		<controllername>org.olat.course.editor.EditorMainController</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.doPost(OpenOLATServlet.java:211)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.course.nodes.cl.manager.CheckboxManagerImpl.loadCheck(CheckboxManagerImpl.java:344)
   at org.olat.course.nodes.cl.manager.CheckboxManagerImpl.check(CheckboxManagerImpl.java:262)
   at org.olat.course.nodes.cl.ui.CheckListRunController.doCheck(CheckListRunController.java:287)
   at org.olat.course.nodes.cl.ui.CheckListRunController.formInnerEvent(CheckListRunController.java:253)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:359)
   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.form.flexible.impl.FormWrapperContainer.fireFormEvent(FormWrapperContainer.java:135)
   at org.olat.core.gui.components.form.flexible.impl.Form.fireFormEvent(Form.java:792)