RS in sort of binder entries

2017-02-08 13:43:08,326 [ajp-nio2-8008-exec-171] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N8-E59 ^%^ org.olat.core.logging
https://olat.xyz.ch/auth/HomeSite/287670276/PortfolioV2/0/MyBinders/0/Binder/313/Entries/0
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 ^%^ **RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_binder_pages</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.elements.table.FlexiTableSearchEvent</class&gt;
			<command>ftQuickSearch</command>
			<tostring>com:ftQuickSearch,org.olat.core.gui.components.form.flexible.impl.elements.table.FlexiTableSearchEvent@f260c066</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.modules.portfolio.ui.BinderPageListController</controllername>
		<controllername>org.olat.modules.portfolio.ui.BinderController</controllername>
		<controllername>org.olat.modules.portfolio.ui.BinderListController</controllername>
		<controllername>org.olat.modules.portfolio.ui.PortfolioHomeController</controllername>
		<controllername>org.olat.modules.portfolio.ui.PortfolioPersonalToolController</controllername>
		<controllername>org.olat.home.HomeMainController</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:548)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:241)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:273)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:190)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:292)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:235)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.modules.portfolio.ui.PageListDataModel.sort(PageListDataModel.java:78)
   at org.olat.core.gui.components.form.flexible.impl.elements.table.FlexiTableElementImpl.reloadData(FlexiTableElementImpl.java:1582)
   at org.olat.modules.portfolio.ui.BinderPageListController.loadModel(BinderPageListController.java:329)
   at org.olat.modules.portfolio.ui.AbstractPageListController.formInnerEvent(AbstractPageListController.java:567)
   at org.olat.modules.portfolio.ui.BinderPageListController.formInnerEvent(BinderPageListController.java:383)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:430)
   at org.olat.modules.portfolio.ui.BinderPageListController.event(BinderPageListController.java:399)
   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)