Upgrader error by video metadata migration

2017-06-12 23:02:51,990 [ActiveMQ Session Task-1] ERROR OLATUpgrade_11_3_0 
OLAT::ERROR ^%^ N49-E4 ^%^ org.olat.upgrade ^%^ n/a ^%^ n/a ^%^ n/a ^%^ n/a
Update Metadata failed ^%^ >>>stack of 1.cause::java.lang.NullPointerException: null
-> at org.olat.modules.video.manager.VideoManagerImpl.hasMasterContainer(VideoManagerImpl.java:582)
   at org.olat.upgrade.OLATUpgrade_11_3_0.processVideoResource(OLATUpgrade_11_3_0.java:117)
   at org.olat.upgrade.OLATUpgrade_11_3_0.upgradeVideoXml(OLATUpgrade_11_3_0.java:104)
   at org.olat.upgrade.OLATUpgrade_11_3_0.doPostSystemInitUpgrade(OLATUpgrade_11_3_0.java:84)
   at org.olat.upgrade.UpgradeManagerImpl.doPostSystemInitUpgrades(UpgradeManagerImpl.java:78)
   at org.olat.upgrade.UpgradeManager.event(UpgradeManager.java:204)
   at org.olat.core.util.event.AbstractEventBus$2.run(AbstractEventBus.java:171)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.util.event.AbstractEventBus.doFire(AbstractEventBus.java:168)
   at org.olat.core.util.event.AbstractEventBus.doFire(AbstractEventBus.java:141)
   at org.olat.commons.coordinate.cluster.jms.ClusterEventBus.serveMessage(ClusterEventBus.java:336)

2017-06-12 23:02:57,188 [ActiveMQ Session Task-1] ERROR VideoManagerImpl  - OLAT::ERROR ^%^ N49-E27 ^%^ org.olat.modules.video.manager
Error while parsing XStream file for videoResource:: OLATResource(316407885)[FileResource.VIDEO(95238092053221)], key:316407885=org.olat.resource.OLATResourceImpl@12dc004d
>>>stack of 1.cause::java.lang.NullPointerException: null
-> at org.olat.core.util.xml.XStreamHelper.readObject(XStreamHelper.java:313)
   at org.olat.modules.video.manager.VideoManagerImpl.isMetadataFileValid(VideoManagerImpl.java:388)
   at org.olat.upgrade.OLATUpgrade_11_3_0.processVideoResource(OLATUpgrade_11_3_0.java:124)
   at org.olat.upgrade.OLATUpgrade_11_3_0.upgradeVideoXml(OLATUpgrade_11_3_0.java:104)
   at org.olat.upgrade.OLATUpgrade_11_3_0.doPostSystemInitUpgrade(OLATUpgrade_11_3_0.java:84)
   at org.olat.upgrade.UpgradeManagerImpl.doPostSystemInitUpgrades(UpgradeManagerImpl.java:78)
   at org.olat.upgrade.UpgradeManager.event(UpgradeManager.java:204)
   at org.olat.core.util.event.AbstractEventBus$2.run(AbstractEventBus.java:171)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.util.event.AbstractEventBus.doFire(AbstractEventBus.java:168)
   at org.olat.core.util.event.AbstractEventBus.doFire(AbstractEventBus.java:141)