2016-12-27 15:37:07,635 [ajp-nio2-8068-exec-4] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N68-E13 ^%^ org.olat.core.logging
https:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
**RedScreen** attempt to create delete event with null entity
<dispatchinfo>
<componentinfo>
<compname>link_0</compname>
<compclass>org.olat.core.gui.components.link.Link</compclass>
<extendedinfo>n/a</extendedinfo>
<event>
<class>org.olat.core.gui.control.Event</class>
<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.course.certificate.ui.CertificateAndEfficiencyStatementListController</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: attempt to create delete event with null entity
-> 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:547)
at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:240)
at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:275)
at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:192)
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.IllegalArgumentException: attempt to create delete event with null entity
-> at org.hibernate.event.spi.DeleteEvent.<init>(DeleteEvent.java:48)
at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:896)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:1214)
at org.olat.course.assessment.EfficiencyStatementManager.deleteEfficiencyStatement(EfficiencyStatementManager.java:684)
at org.olat.course.certificate.ui.CertificateAndEfficiencyStatementListController.doDelete(CertificateAndEfficiencyStatementListController.java:304)
at org.olat.course.certificate.ui.CertificateAndEfficiencyStatementListController.event(CertificateAndEfficiencyStatementListController.java:277)
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)