video story board should not process version documents

2013-10-31 13:24:50,040 ERROR [Nuxeo-Work-default-3] [org.nuxeo.ecm.core.event.impl.AsyncEventExecutor] Failed to execute async event default on listener videoStoryboardListener
org.nuxeo.ecm.core.api.ClientException: failed to write document part
        at org.nuxeo.ecm.core.api.DocumentModelFactory.writeDocumentModel(DocumentModelFactory.java:305)
        at org.nuxeo.ecm.core.api.AbstractSession.writeModel(AbstractSession.java:558)
        at org.nuxeo.ecm.core.api.AbstractSession.saveDocument(AbstractSession.java:1981)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.nuxeo.ecm.core.api.TransactionalCoreSessionWrapper.invoke(TransactionalCoreSessionWrapper.java:136)
        at com.sun.proxy.$Proxy101.saveDocument(Unknown Source)
        at org.nuxeo.ecm.platform.video.listener.VideoStoryboardListener.handleEvent(VideoStoryboardListener.java:77)
        at org.nuxeo.ecm.platform.video.listener.VideoStoryboardListener.handleEvent(VideoStoryboardListener.java:52)
        at org.nuxeo.ecm.core.event.impl.AsyncEventExecutor$ListenerWork.work(AsyncEventExecutor.java:153)
        at org.nuxeo.ecm.core.work.AbstractWork.run(AbstractWork.java:163)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
Caused by: org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentVersion$VersionNotModifiableException: Cannot set property on a version: genre = null
        at org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentVersion.setPropertyValue(SQLDocumentVersion.java:254)
        at org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentLive.writeDocumentPart(SQLDocumentLive.java:178)