Arithmetic Exception in MPerf when sending less than 10 messages

Not sure if this is intended to be like this, but in MPerf when the user tries to set the num_msg to 1 and start sending the messages, MPerf throws

Mar 22, 2014 4:02:25 PM org.jgroups.logging.JDKLogImpl error
SEVERE: failure unmarshalling buffer
java.lang.ArithmeticException: / by zero
at org.jgroups.tests.perf.MPerf.handleData(MPerf.java:418)
at org.jgroups.tests.perf.MPerf.receive(MPerf.java:280)
at org.jgroups.JChannel.invokeCallback(JChannel.java:890)
at org.jgroups.JChannel.up(JChannel.java:746)
at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1030)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:146)
at org.jgroups.protocols.FRAG2.up(FRAG2.java:165)
at org.jgroups.protocols.SEQUENCER.deliver(SEQUENCER.java:606)
at org.jgroups.protocols.SEQUENCER.unwrapAndDeliver(SEQUENCER.java:573)
at org.jgroups.protocols.SEQUENCER.up(SEQUENCER.java:279)
at org.jgroups.protocols.SEQUENCER.up(SEQUENCER.java:308)
at org.jgroups.protocols.FlowControl.up(FlowControl.java:434)
at org.jgroups.protocols.FlowControl.up(FlowControl.java:434)
at org.jgroups.stack.Protocol.up(Protocol.java:409)
at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:294)
at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:520)
at org.jgroups.protocols.pbcast.NAKACK2.deliverBatch(NAKACK2.java:927)
at org.jgroups.protocols.pbcast.NAKACK2.removeAndPassUp(NAKACK2.java:857)
at org.jgroups.protocols.pbcast.NAKACK2.handleMessage(NAKACK2.java:792)
at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:573)
at org.jgroups.protocols.BARRIER.up(BARRIER.java:152)
at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:147)
at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:199)
at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:296)
at org.jgroups.protocols.MERGE2.up(MERGE2.java:209)
at org.jgroups.protocols.Discovery.up(Discovery.java:379)
at org.jgroups.protocols.TP.passMessageUp(TP.java:1532)
at org.jgroups.protocols.TP$3.run(TP.java:1466)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)