Build expiry job is unable to expire build due to HibernateSystemException (not-null property references a null or transient value)

2014-09-15 01:10:59,095 WARN [scheduler_Worker-9] [BuildExpiryBeanImpl] Unable to expire MASTERONE-CIFUNCHAL865-2
org.springframework.orm.hibernate.HibernateSystemException: not-null property references a null or transient value: com.atlassian.bamboo.build.artifact.DefaultArtifactLink.artifact; nested exception is net.sf.hibernate.PropertyValueExcepti
on: not-null property references a null or transient value: com.atlassian.bamboo.build.artifact.DefaultArtifactLink.artifact
        at org.springframework.orm.hibernate.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:597)
        at org.springframework.orm.hibernate.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:353)
        at org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:375)
        at org.springframework.orm.hibernate.HibernateTemplate.deleteAll(HibernateTemplate.java:661)
        at com.atlassian.bamboo.build.artifact.ArtifactLinkHibernateDao.removeAll(ArtifactLinkHibernateDao.java:42)
        at sun.reflect.GeneratedMethodAccessor6623.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
        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.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy96.removeAll(Unknown Source)
        at com.atlassian.bamboo.build.artifact.DefaultArtifactLinkManager.removeArtifactLinks(DefaultArtifactLinkManager.java:216)
        at com.atlassian.bamboo.resultsummary.BuildResultsSummaryManagerImpl.removeArtifacts(BuildResultsSummaryManagerImpl.java:1089)
        at sun.reflect.GeneratedMethodAccessor6624.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
        at com.atlassian.bamboo.security.acegi.intercept.aopalliance.AuthorityOverrideMethodSecurityInterceptor.invoke(AuthorityOverrideMethodSecurityInterceptor.java:30)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at com.sun.proxy.$Proxy64.removeArtifacts(Unknown Source)
        at com.atlassian.bamboo.build.expiry.BuildExpiryBeanImpl.expirePlan(BuildExpiryBeanImpl.java:260)
        at com.atlassian.bamboo.build.expiry.BuildExpiryBeanImpl.expireAllBuilds(BuildExpiryBeanImpl.java:129)
        at com.atlassian.bamboo.build.expiry.BuildExpiryScheduler$BuildExpiryJob.execute(BuildExpiryScheduler.java:113)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at com.atlassian.bamboo.utils.BambooRunnables$1.run(BambooRunnables.java:49)
        at com.atlassian.bamboo.security.ImpersonationHelper.runWith(ImpersonationHelper.java:31)
        at com.atlassian.bamboo.security.ImpersonationHelper.runWithSystemAuthority(ImpersonationHelper.java:20)
        at com.atlassian.bamboo.security.ImpersonationHelper$1.run(ImpersonationHelper.java:52)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
Caused by: net.sf.hibernate.PropertyValueException: not-null property references a null or transient value: com.atlassian.bamboo.build.artifact.DefaultArtifactLink.artifact
        at net.sf.hibernate.impl.SessionImpl.checkNullability(SessionImpl.java:1289)
        at net.sf.hibernate.impl.SessionImpl.doDelete(SessionImpl.java:1257)
        at net.sf.hibernate.impl.SessionImpl.delete(SessionImpl.java:1185)
        at org.springframework.orm.hibernate.HibernateTemplate$17.doInHibernate(HibernateTemplate.java:665)
        at org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:370)
        ... 35 more