NPE in the audit logger

2011-03-09 16:54:52,122 INFO [TP-Processor267] [AccessLogFilter] adeccico POST https://bamboo.extranet.atlassian.com/chain/admin/config/saveChainDetails.action 99831kb
2011-03-09 16:54:52,142 ERROR [TP-Processor267] [HibernateObjectsAuditInterceptor] Error while trying to record configuration changes
java.lang.NullPointerException
	at com.atlassian.bamboo.persister.HibernateObjectsAuditInterceptor.checkPlanChanges(HibernateObjectsAuditInterceptor.java:131)
	at com.atlassian.bamboo.persister.HibernateObjectsAuditInterceptor.onFlushDirty(HibernateObjectsAuditInterceptor.java:73)
	at org.springframework.orm.hibernate.support.ChainedInterceptorSupport.onFlushDirty(ChainedInterceptorSupport.java:98)
	at net.sf.hibernate.impl.SessionImpl.flushEntity(SessionImpl.java:2565)
	at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2484)
	at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2279)
	at net.sf.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1813)
	at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:3650)
	at net.sf.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:238)