java.lang.NullPointerException

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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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