Exception when querying a composite-keyed table with a collection index

  
CREATE TABLE products (
      account text,
      id int,
      categories set<text>,
      PRIMARY KEY (account, id)
);

CREATE INDEX cat_index ON products(categories);

SELECT * FROM products WHERE account = 'xyz' AND categories CONTAINS 'lmn';
errors={}, last_host=127.0.0.1

WARN  17:01:49 Uncaught exception on thread Thread[SharedPool-Worker-2,5,main]: {}
java.lang.RuntimeException: java.lang.IndexOutOfBoundsException
	at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2015) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_25]
	at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:162) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:103) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_25]
Caused by: java.lang.IndexOutOfBoundsException: null
	at org.apache.cassandra.db.composites.Composites$EmptyComposite.get(Composites.java:60) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.index.composites.CompositesIndexOnCollectionKey.makeIndexColumnPrefix(CompositesIndexOnCollectionKey.java:78) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.index.composites.CompositesSearcher.makePrefix(CompositesSearcher.java:82) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.index.composites.CompositesSearcher.getIndexedIterator(CompositesSearcher.java:116) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.index.composites.CompositesSearcher.search(CompositesSearcher.java:68) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.index.SecondaryIndexManager.search(SecondaryIndexManager.java:589) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.ColumnFamilyStore.search(ColumnFamilyStore.java:2060) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.db.RangeSliceCommand.executeLocally(RangeSliceCommand.java:131) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.service.StorageProxy$LocalRangeSliceRunnable.runMayThrow(StorageProxy.java:1368) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2011) ~[apache-cassandra-2.1.0-rc1.jar:2.1.0-rc1]
	... 4 common frames omitted

SELECT * FROM products WHERE categories CONTAINS 'lmn';