CurrentContentForLabelAndSpace throws class cast exceptions

[INFO] [talledLocalContainer] 2012-06-11 12:08:21,698 ERROR [http-1990-2] [xhtml.view.macro.ViewMacroMarshaller] marshal Error rendering macro: detailssummary
[INFO] [talledLocalContainer]  -- url: /confluence/pages/viewpage.action | userName: admin | action: viewpage | page: 917525
[INFO] [talledLocalContainer] java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.atlassian.confluence.labels.Labelling
[INFO] [talledLocalContainer] 	at com.atlassian.confluence.labels.persistence.dao.hibernate.HibernateLabelDao$10.apply(HibernateLabelDao.java:857)
[INFO] [talledLocalContainer] 	at com.google.common.collect.Lists$TransformingRandomAccessList.get(Lists.java:451)
[INFO] [talledLocalContainer] 	at java.util.AbstractList$Itr.next(AbstractList.java:345)
[INFO] [talledLocalContainer] 	at com.google.common.collect.Iterators$7.computeNext(Iterators.java:644)
[INFO] [talledLocalContainer] 	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
[INFO] [talledLocalContainer] 	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
[INFO] [talledLocalContainer] 	at com.google.common.collect.Iterators.size(Iterators.java:147)
[INFO] [talledLocalContainer] 	at com.google.common.collect.Collections2$FilteredCollection.size(Collections2.java:222)
[INFO] [talledLocalContainer] 	at com.google.common.collect.Collections2$TransformedCollection.size(Collections2.java:288)
[INFO] [talledLocalContainer] 	at java.util.AbstractCollection.toArray(AbstractCollection.java:119)
[INFO] [talledLocalContainer] 	at java.util.ArrayList.<init>(ArrayList.java:131)
[INFO] [talledLocalContainer] 	at com.atlassian.confluence.extra.masterdetail.DetailsSummaryMacro.execute(DetailsSummaryMacro.java:227)