RS concurrent modification in blog

2016-01-22 16:45:02,850 [ajp-nio2-8014-exec-50] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N14-E5 

https://xyz.olat.com/auth/1%3A1%3A0%3A0%3A0/Tag.pptx ^%^ Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko 

**RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>feed.edit.item.wskvw_14_92993673542235</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>feed.edit.item.wskvw_14_92993673542235</command>
			<tostring>com:feed.edit.item.wskvw_14_92993673542235,org.olat.core.gui.control.Event@c040503e</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.modules.webFeed.ui.ItemsController</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:245)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:201)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:280)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:209)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
>>> stack of 2.cause::java.util.ConcurrentModificationException: null
-> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
   at java.util.ArrayList$Itr.next(ArrayList.java:851)
   at org.olat.modules.webFeed.ui.ItemsController.createCommentsAndRatingsLinks(ItemsController.java:253)
   at org.olat.modules.webFeed.ui.ItemsController.resetItems(ItemsController.java:751)
   at org.olat.modules.webFeed.ui.ItemsController.event(ItemsController.java:516)
   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.link.Link.dispatch(Link.java:199)
   at org.olat.core.gui.components.link.Link.doDispatchRequest(Link.java:186)