IOBException when querying a table which has 1 file and a subfolder with 1 file

data1
  -- a.json
  -- folder1
       -- b.json

0: jdbc:drill:schema=dfs_eea> select * from `data1`;
+------------+---------------+-----------------+
|    dir0    | executionTime | stationBeanList |
+------------+---------------+-----------------+
| folder1    | 2014-11-04 11:54:01 AM | [{"id":72,"stationName":"W 52 St & 11 Ave", ..........
java.lang.IndexOutOfBoundsException: index: -4, length: 4 (expected: range(0, 4))
	at io.netty.buffer.DrillBuf.checkIndexD(DrillBuf.java:200)
	at io.netty.buffer.DrillBuf.chk(DrillBuf.java:222)
	at io.netty.buffer.DrillBuf.getInt(DrillBuf.java:500)
	at org.apache.drill.exec.vector.UInt4Vector$Accessor.get(UInt4Vector.java:299)
	at org.apache.drill.exec.vector.complex.RepeatedMapVector$RepeatedMapAccessor.getValueCount(RepeatedMapVector.java:470)
	at org.apache.drill.exec.vector.accessor.BoundCheckingAccessor.getObject(BoundCheckingAccessor.java:142)
	at org.apache.drill.jdbc.impl.TypeConvertingSqlAccessor.getObject(TypeConvertingSqlAccessor.java:790)
	at org.apache.drill.jdbc.AvaticaDrillSqlAccessor.getObject(AvaticaDrillSqlAccessor.java:165)
	at net.hydromatic.avatica.AvaticaResultSet.getObject(AvaticaResultSet.java:351)
	at sqlline.SqlLine$Rows$Row.<init>(SqlLine.java:2388)
	at sqlline.SqlLine$IncrementalRows.hasNext(SqlLine.java:2504)
	at sqlline.SqlLine$TableOutputFormat.print(SqlLine.java:2148)
	at sqlline.SqlLine.print(SqlLine.java:1809)
	at sqlline.SqlLine$Commands.execute(SqlLine.java:3766)
	at sqlline.SqlLine$Commands.sql(SqlLine.java:3663)
	at sqlline.SqlLine.dispatch(SqlLine.java:889)
	at sqlline.SqlLine.begin(SqlLine.java:763)
	at sqlline.SqlLine.start(SqlLine.java:498)
	at sqlline.SqlLine.main(SqlLine.java:460)