Batch update row count wrong: 0

I have this exception approximately at backup time and no backup archive in backup directory.

2004-03-03 05:45:11 StandardWrapperValve[action]: Servlet.service() for servlet action threw exception
org.springframework.orm.hibernate.HibernateSystemException: Batch update row count wrong: 0; nested exception is net.sf.hibernate.HibernateException: Batch update row count wrong: 0
net.sf.hibernate.HibernateException: Batch update row count wrong: 0
at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:65)
at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:122)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2385)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2340)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2204)
at net.sf.hibernate.impl.SessionImpl.forceFlush(SessionImpl.java:740)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:820)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:761)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:720)
at org.springframework.orm.hibernate.HibernateTemplate$7.doInHibernate(HibernateTemplate.java:
299)
at org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:149)
at org.springframework.orm.hibernate.HibernateTemplate.save(HibernateTemplate.java:297)
at com.atlassian.confluence.user.persistence.dao.hibernate.ConfluencePropertySetDAO.setImpl(Co
nfluencePropertySetDAO.java:37)
at com.opensymphony.module.propertyset.hibernate.HibernatePropertySet.setImpl(HibernatePropert
ySet.java:166)
at com.opensymphony.module.propertyset.AbstractPropertySet.set(AbstractPropertySet.java:570)
at com.opensymphony.module.propertyset.AbstractPropertySet.setDate(AbstractPropertySet.java:25
3)
at com.atlassian.confluence.user.ConfluenceLoginInterceptor.afterLogin(ConfluenceLoginIntercep
tor.java:47)
..........