RS open concurrently an edit session of a course

2014-04-02 12:10:47,865 [ajp-bio-8021-exec-142] ERROR AssertException - OLAT::ERROR ^%^ N1-E96503 ^%^ org.olat.core.logging 
Mozilla/5.0(Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 ^%^
**RedScreen** There is already an edit session open for this course:89370590316438
<dispatchinfo>
	<componentinfo>
		<compname>edit.cmd</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>gotoeditor</command>
			<tostring>com:gotoeditor,org.olat.core.gui.control.Event@4720ccaf</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.gui.control.generic.tool.ToolControllerImpl</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappPopupBrowserWindow</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.BaseChiefController</controllername>
	</controllerinfo>
</dispatchinfo>
>>>stack of 1.cause::org.olat.core.logging.AssertException: There is already an edit session open for this course: 89370590316438
-> at org.olat.course.CourseFactory.openCourseEditSession(CourseFactory.java:1143)
   at org.olat.course.editor.EditorMainController.<init>(EditorMainController.java:242)
   at org.olat.course.CourseFactory.createEditorController(CourseFactory.java:219)
   at org.olat.course.run.RunMainController.doEdit(RunMainController.java:814)
   at org.olat.course.run.RunMainController.doHandleToolEvents(RunMainController.java:678)
   at org.olat.course.run.RunMainController.event(RunMainController.java:637)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:239)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:236)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:184)
   at org.olat.core.gui.control.generic.tool.ToolControllerImpl.event(ToolControllerImpl.java:229)
>>>stack of 2.cause::java.lang.Exception: assertionstackgenerator
-> at org.olat.core.logging.AssertException.<init>(AssertException.java:53)
   at org.olat.course.CourseFactory.openCourseEditSession(CourseFactory.java:1143)
   at org.olat.course.editor.EditorMainController.<init>(EditorMainController.java:242)
   at org.olat.course.CourseFactory.createEditorController(CourseFactory.java:219)
   at org.olat.course.run.RunMainController.doEdit(RunMainController.java:814)
   at org.olat.course.run.RunMainController.doHandleToolEvents(RunMainController.java:678)
   at org.olat.course.run.RunMainController.event(RunMainController.java:637)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:239)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:236)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:184)