Random msgpack compilation errors in radio

[bernd]

The following error sometimes appears when starting radio.

org.msgpack.MessageTypeException: org.msgpack.template.builder.TemplateBuildException: Cannot compile: 
{
  if (!$3 && $1.trySkipNil()) {
    return null;
  }
  org.graylog2.plugin.RadioMessage _$$_t;
  if ($2 == null) {
    _$$_t = new org.graylog2.plugin.RadioMessage();
  } else {
    _$$_t = (org.graylog2.plugin.RadioMessage) $2;
  }
  $1.readArrayBegin();
  if ($1.trySkipNil()) {  } else {
    _$$_t.strings = (java.util.Map) this.templates[0].read($1, _$$_t.strings);
  }
  if ($1.trySkipNil()) {  } else {
    _$$_t.longs = (java.util.Map) this.templates[1].read($1, _$$_t.longs);
  }
  if ($1.trySkipNil()) {  } else {
    _$$_t.doubles = (java.util.Map) this.templates[2].read($1, _$$_t.doubles);
  }
    _$$_t.timestamp = $1.readLong();
  $1.readArrayEnd();
  return _$$_t;
}

    at org.msgpack.template.TemplateRegistry.buildAndRegister(TemplateRegistry.java:575)
    at org.msgpack.template.TemplateRegistry.lookupAfterBuilding(TemplateRegistry.java:472)
    at org.msgpack.template.TemplateRegistry.lookup(TemplateRegistry.java:251)
    at org.msgpack.MessagePack.write(MessagePack.java:195)
    at org.graylog2.plugin.RadioMessage.serialize(RadioMessage.java:68)
    at org.graylog2.radio.transports.amqp.AMQPSender.send(AMQPSender.java:104)
    at org.graylog2.radio.transports.amqp.AMQPProducer$AMQPSenderPool.send(AMQPProducer.java:68)
    at org.graylog2.radio.transports.amqp.AMQPProducer.send(AMQPProducer.java:92)
    at org.graylog2.radio.buffers.processors.RadioProcessBufferProcessor.handleMessage(RadioProcessBufferProcessor.java:64)
    at org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:65)
    at org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:33)
    at com.lmax.disruptor.WorkProcessor.run(WorkProcessor.java:138)
    at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
    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:745)