RS deleting a section where page list has an error in its list numbering

2017-09-25 08:53:46,360 [ajp-nio2-8026-exec-7] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N26-E2 ^%^ org.olat.core.logging
https://xyz.olat.com/auth/HomeSite/178290736/PortfolioV2/0/MyBinders/0/Binder/117/Toc/0

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36 OPR/47.0.2631.83

**RedScreen**
<dispatchinfo>
	<componentinfo>
		<compname>link_0</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>link_0</command>
			<tostring>com:link_0,org.olat.core.gui.control.Event@be46a54a</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.gui.control.generic.modal.DialogBoxController</controllername>
		<controllername>org.olat.modules.portfolio.ui.TableOfContentController</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:549)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:242)
   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:289)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:232)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.modules.portfolio.manager.PageDAO.deletePage(PageDAO.java:446)
   at org.olat.modules.portfolio.manager.BinderDAO.deleteSection(BinderDAO.java:573)
   at org.olat.modules.portfolio.manager.PortfolioServiceImpl.deleteSection(PortfolioServiceImpl.java:468)
   at org.olat.modules.portfolio.ui.TableOfContentController.doDelete(TableOfContentController.java:760)
   at org.olat.modules.portfolio.ui.TableOfContentController.event(TableOfContentController.java:484)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:246)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:243)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:190)
   at org.olat.core.gui.control.generic.modal.DialogBoxController.event(DialogBoxController.java:205)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)