RS alien items from QTI 1.2 to QTI 2.1

Error code: N2-E13 Last business path:
2017-02-08 11:24:14,039 [ajp-nio2-8002-exec-7] WARN ExceptionWindowController - OLAT::WARN ^%^ N2-W701 ^%^ org.olat.core.gui.exception
https://community.openolat.org/auth/RepositoryEntry/218824705
Mozilla/5.0 (Windows NT 10.0; rv:49.0) Gecko/20100101 Firefox/49.0 ^%^ ExceptionWindowController: Throwable occurred, logging the full stacktrace:
>>>stack of 1.cause::java.lang.NullPointerException: null
-> at org.olat.ims.qti21.pool.QTI12To21Converter.convert(QTI12To21Converter.java:214)
   at org.olat.ims.qti21.pool.QTI12To21Converter.convert(QTI12To21Converter.java:166)
   at org.olat.ims.qti21.pool.QTI12To21Converter.convert(QTI12To21Converter.java:133)
   at org.olat.ims.qti21.pool.QTI21QPoolServiceProvider.convertFromEditorPackage(QTI21QPoolServiceProvider.java:508)
   at org.olat.ims.qti21.repository.handlers.QTI21AssessmentTestHandler.createResource(QTI21AssessmentTestHandler.java:174)
   at org.olat.repository.ui.author.CreateRepositoryEntryController.doCreate(CreateRepositoryEntryController.java:176)
   at org.olat.repository.ui.author.CreateRepositoryEntryController.formOK(CreateRepositoryEntryController.java:152)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:389)
   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)