Concurrent Modification Exception caused when accessing an RSS feed

Caused by: java.util.ConcurrentModificationException: Cache "com.atlassian.confluence.labels.Label": Resource is locked by another thread or member: Lease: 500072452 (Cache=com.atlassian.confluence.labels.Label, Size=679, Version=2/2, IssuerId=1, HolderId=1, Status=LEASE_LOCKED, Held by Thread[DefaultQuartzScheduler_Worker-2,5,main], Locked at Mon Sep 03 04:01:01 CDT 2007, Expires in 9223370847964570614 millis)
	at com.tangosol.coherence.component.util.CacheHandler.reportException(CacheHandler.CDB:3)
	at com.tangosol.coherence.component.util.CacheHandler.put(CacheHandler.CDB:30)
	at com.tangosol.coherence.component.util.CacheHandler.put(CacheHandler.CDB:1)
	at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
	at com.atlassian.confluence.cache.tangosol.hibernate.CoherenceHibernateCache.put(CoherenceHibernateCache.java:30)
	at net.sf.hibernate.cache.ReadWriteCache.put(ReadWriteCache.java:146)
	at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2228)
	at net.sf.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:319)
	at net.sf.hibernate.loader.Loader.doQuery(Loader.java:309)
	at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:138)
	at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:1020)
	at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:995)
	at net.sf.hibernate.loader.OneToManyLoader.initialize(OneToManyLoader.java:93)
	at net.sf.hibernate.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:288)
	at net.sf.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:3315)
	at net.sf.hibernate.collection.PersistentCollection.initialize(PersistentCollection.java:195)