QTI 2.1 RS using reset function in assessment tool

https://testing.frentix.com/test8/auth/RepositoryEntry/430800896/assessmentToolv2/0/Users/0/Node/95221517971567
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 (KHTML, like Gecko) Version/10.0.3 Safari/602.4.8
Log msg: **RedScreen** null
reset.test.data.title org.olat.core.gui.components.link.Link
n/a	org.olat.core.gui.control.Event	reset.test.data.title
com:reset.test.data.title,org.olat.core.gui.control.Event@48933f70

org.olat.ims.qti21.ui.QTI21ResetToolController
org.olat.course.assessment.ui.tool.IdentityListCourseNodeController
org.olat.course.assessment.ui.tool.AssessmentCourseTreeController
org.olat.course.assessment.ui.tool.AssessmentToolController
org.olat.course.run.CourseRuntimeController
org.olat.core.commons.fullWebApp.BaseFullWebappController

Cause: stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.(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.ims.qti21.ui.QTI21ResetToolController$ConfirmResetController.initForm(QTI21ResetToolController.java:247)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.initForm(FormBasicController.java:280)
   at org.olat.ims.qti21.ui.QTI21ResetToolController$ConfirmResetController.(QTI21ResetToolController.java:240)
   at org.olat.ims.qti21.ui.QTI21ResetToolController.doConfirmReset(QTI21ResetToolController.java:161)
   at org.olat.ims.qti21.ui.QTI21ResetToolController.event(QTI21ResetToolController.java:132)
   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:199)
   at org.olat.core.gui.components.link.Link.doDispatchRequest(Link.java:186)