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

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via XWiki.org JIRA by Lucien Pereira, 1 year ago
This exception has no message.
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)