How to reproduce:
- User A open a course, than open the editor
- User A go to an other tab
- User B delete the course
- User A close the course with the red cross in the top navigation -> red screen
2016-02-18 12:00:56,278 [ajp-nio2-8021-exec-29] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N1-E43 https://xyz.de/auth/RepositorySite/0/My/0 ^%^ Mozilla/5.0 (Windows NT 6.1; rv:44.0) Gecko/20100101 Firefox/44.0 ^%^ **RedScreen** <dispatchinfo> <componentinfo> <compname>c3</compname> <compclass>org.olat.core.gui.components.link.Link</compclass> <extendedinfo>n/a</extendedinfo> <event> <class>org.olat.core.gui.control.Event</class> <command>c3</command> <tostring>com:c3,org.olat.core.gui.control.Event@c4f</tostring> </event> </componentinfo> <controllerinfo> <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:298) at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:216) 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.course.PersistingCourseImpl.<init>(PersistingCourseImpl.java:128) at org.olat.course.CourseFactory.loadCourse(CourseFactory.java:289) at org.olat.course.editor.EditorMainController.requestForClose(EditorMainController.java:355) at org.olat.course.run.CourseRuntimeController.requestForClose(CourseRuntimeController.java:689) at org.olat.core.commons.fullWebApp.BaseFullWebappController.requestCloseTab(BaseFullWebappController.java:1043) at org.olat.core.commons.fullWebApp.BaseFullWebappController.event(BaseFullWebappController.java:622) 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:198)