RS concurrent edit course and edit course option

2018-01-14 18:46:14,006 [ajp-nio-8028-exec-3] ERROR AssertException  - OLAT::ERROR ^%^ N8-E30 ^%^ org.olat.core.logging
https://testing.frentix.com/test8/auth/RepositoryEntry/512098304/CourseNode/96080193908717 ^%^ Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 
**RedScreen** There is already an edit session open for this course: 96080193908715

<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_barebone</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.FormEvent</class&gt;
			<command>done</command>
			<tostring>com:done,org.olat.core.gui.components.form.flexible.impl.FormEvent@2f23a1</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.course.config.ui.CourseOptionsController</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.AssertException: There is already an edit session open for this course: 96080193908715
-> at org.olat.course.CourseFactory.openCourseEditSession(CourseFactory.java:980)
   at org.olat.course.config.ui.CourseOptionsController.doChangeConfig(CourseOptionsController.java:464)
   at org.olat.course.config.ui.CourseOptionsController.doSave(CourseOptionsController.java:458)
   at org.olat.course.config.ui.CourseOptionsController.formInnerEvent(CourseOptionsController.java:387)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:421)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:240)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:238)
   at org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer.fireFormEvent(FormWrapperContainer.java:148)
   at org.olat.core.gui.components.form.flexible.impl.Form.fireFormEvent(Form.java:788)
>>>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:980)
   at org.olat.course.config.ui.CourseOptionsController.doChangeConfig(CourseOptionsController.java:464)
   at org.olat.course.config.ui.CourseOptionsController.doSave(CourseOptionsController.java:458)
   at org.olat.course.config.ui.CourseOptionsController.formInnerEvent(CourseOptionsController.java:387)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:421)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:240)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:238)
   at org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer.fireFormEvent(FormWrapperContainer.java:148)