RS edit QTI 2.1 test with logout

2017-06-28 15:56:23,526 [ajp-nio2-8069-exec-75] ERROR Window - OLAT::ERROR ^%^ N69-E13 ^%^ org.olat.core.gui.components
https://edu.xyz.ch/auth/RepositoryEntry/11436044/Editor/0
Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
**RedScreen** exception while rendering component 'qtirun_cmp' (org.olat.ims.qti21.ui.components.AssessmentTestComponent) listener:[]<br />Message of exception: null
>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: exception while rendering component 'qtirun_cmp' (org.olat.ims.qti21.ui.components.AssessmentTestComponent) listener:[]<br />Message of exception: null
-> at org.olat.core.gui.components.Window.handleDirties(Window.java:1007)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:468)
   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:292)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:235)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
   at org.olat.core.servlets.OpenOLATServlet.service(OpenOLATServlet.java:178)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.ims.qti21.ui.components.AssessmentTestComponentRenderer.renderTestItemBody(AssessmentTestComponentRenderer.java:339)
   at org.olat.ims.qti21.ui.components.AssessmentTestComponentRenderer.renderTestItem(AssessmentTestComponentRenderer.java:224)
   at org.olat.ims.qti21.ui.components.AssessmentTestComponentRenderer.renderTestEvent(AssessmentTestComponentRenderer.java:164)
   at org.olat.ims.qti21.ui.components.AssessmentTestComponentRenderer.render(AssessmentTestComponentRenderer.java:126)
   at org.olat.core.gui.render.Renderer.render(Renderer.java:236)
   at org.olat.core.gui.render.Renderer.render(Renderer.java:186)
   at org.olat.core.gui.render.velocity.VelocityRenderDecorator.doRender(VelocityRenderDecorator.java:676)
   at org.olat.core.gui.render.velocity.VelocityRenderDecorator.render(VelocityRenderDecorator.java:367)
   at sun.reflect.GeneratedMethodAccessor198.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)