Scheduled Backup Job fails when processing audit log.

2013-12-10 10:22:28,775 INFO [QuartzScheduler_Worker-6] [XmlMigrator] Writing xml to file: /tools/bamboo/bamboo-home/backups/bamboo_backup_2013_12_10.zip/db-export/auditLogs.xml
2013-12-10 10:22:28,775 INFO [QuartzScheduler_Worker-6] [XmlMigrator] Exporting with: com.atlassian.bamboo.migration.stream.AuditLogMapper@189f14d
2013-12-10 10:22:29,314 INFO [QuartzScheduler_Worker-6] [XmlMigrator] Ensuring the the file has been unmounted
2013-12-10 10:22:29,314 INFO [QuartzScheduler_Worker-6] [XmlMigrator] Unmounted /tools/bamboo/bamboo-home/backups/bamboo_backup_2013_12_10.zip
2013-12-10 10:22:29,332 INFO [QuartzScheduler_Worker-6] [ServerLifecycleManagerImpl] Server state changed to 'RUNNING' from 'PAUSED'
2013-12-10 10:22:29,332 ERROR [QuartzScheduler_Worker-6] [ScheduledBackupJob] java.lang.NullPointerException
java.lang.NullPointerException
        at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:453)
        at org.codehaus.staxmate.out.SMOutputContext.writeCharacters(SMOutputContext.java:479)
        at org.codehaus.staxmate.out.SMOutputContainer.addCharacters(SMOutputContainer.java:171)
        at com.atlassian.bamboo.migration.SMOutputElementAppender.append(SMOutputElementAppender.java:39)
        at com.atlassian.bamboo.migration.stream.AuditLogMapper.exportProperties(AuditLogMapper.java:126)
        at com.atlassian.bamboo.migration.stream.AuditLogMapper.exportProperties(AuditLogMapper.java:25)
        at com.atlassian.bamboo.migration.BambooStAXMappingHelperAbstractImpl.exportXml(BambooStAXMappingHelperAbstractImpl.java:107)
        at com.atlassian.bamboo.migration.BambooStAXMappingListHelperAbstractImpl.exportListXml(BambooStAXMappingListHelperAbstractImpl.java:167)
        at com.atlassian.bamboo.migration.BambooStAXMappingListHelperAbstractImpl.exportListXml(BambooStAXMappingListHelperAbstractImpl.java:146)
        at com.atlassian.bamboo.migration.stream.AuditLogMapper.exportData(AuditLogMapper.java:224)
        at com.atlassian.bamboo.migration.XmlMigrator.exportToStream(XmlMigrator.java:499)
        at com.atlassian.bamboo.migration.XmlMigrator.exportXml(XmlMigrator.java:429)
        at com.atlassian.bamboo.migration.XmlMigrator$$FastClassByCGLIB$$b6578fc7.invoke(<generated>)
        at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
        at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:694)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:629)
        at com.atlassian.bamboo.migration.XmlMigrator$$EnhancerByCGLIB$$2f033560.exportXml(<generated>)
        at com.atlassian.bamboo.migration.ImportExportManagerImpl.bambooExport(ImportExportManagerImpl.java:95)
        at com.atlassian.bamboo.configuration.ScheduledBackupJob.execute(ScheduledBackupJob.java:74)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at com.atlassian.bamboo.quartz.SystemAuthorizedThreadPool$1.run(SystemAuthorizedThreadPool.java:38)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)