2.1 EmptyComposite cannot be cast - SliceQueryPager

 ERROR [SharedPool-Worker-3] 2015-09-07 12:01:18,101 ErrorMessage.java:251 - Unexpected exception during request java.lang.ClassCastException: org.apache.cassandra.db.composites.Composites$EmptyComposite cannot be cast to org.apache.cassandra.db.composites.CellName at org.apache.cassandra.service.pager.SliceQueryPager.<init>(SliceQueryPager.java:64) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.service.pager.MultiPartitionPager.makePager(MultiPartitionPager.java:86) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.service.pager.MultiPartitionPager.<init>(MultiPartitionPager.java:69) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.service.pager.QueryPagers.pager(QueryPagers.java:102) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.service.pager.QueryPagers.pager(QueryPagers.java:126) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:228) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:67) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:238) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:493) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] at com.datastax.bdp.cassandra.cql3.DseQueryHandler$PreparedStatementExecution.execute(DseQueryHandler.java:310) ~[dse.jar:4.7.3]
and schema

CREATE TABLE events (
  campaignid uuid,
  eventtype int,
  occurrence timeuuid,
  city text,
  clientproductid uuid,
  continentiso text,
  continentname text,
  countryiso text,
  countryname text,
  ip text,
  ipzip text,
  isus boolean,
  latitude double,
  longitude double,
  masterproductid uuid,
  offersitekeys LIST<uuid>,
  stateiso text,
  statename text,
  userid uuid,
  visitorsource text,
  zip text,
  PRIMARY KEY (( campaignid, eventtype ), occurrence)
)