java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.xpn.xwiki.doc.XWikiDocument.getPreviousVersion(XWikiDocument.java:5224)
at com.xpn.xwiki.annotation.internal.maintainment.AbstractAnnotationMaintainer.onEvent(AbstractAnnotationMaintainer.java:175)
at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:250)
at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:224)
at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1330)
at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1265)
at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1260)

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