jeromq-0.5.2 make thread crashed

[jqwyy]

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)
at zmq.socket.LB.hasOut(LB.java:135)
at zmq.socket.reqrep.Dealer.xhasOut(Dealer.java:83)
at zmq.SocketBase.hasOut(SocketBase.java:883)
at zmq.SocketBase.getSocketOpt(SocketBase.java:259)
at zmq.poll.PollItem.readyOps(PollItem.java:120)
at zmq.ZMQ.poll(ZMQ.java:723)
at org.zeromq.ZPoller.poll(ZPoller.java:700)
at org.zeromq.ZPoller.poll(ZPoller.java:673)
at org.zeromq.ZPoller.poll(ZPoller.java:654)