java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.RuntimeException: java.lang.NullPointerException
at clojure.lang.RT.intCast(RT.java:1087)
at backtype.storm.daemon.worker$mk_transfer_fn$fn__3548.invoke(worker.clj:129)
at backtype.storm.daemon.executor$start_batch_transfer__GT_worker_handler_BANG_$fn__3282.invoke(executor.clj:258)
at backtype.storm.disruptor$clojure_handler$reify__746.onEvent(disruptor.clj:58)
at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:125)
at backtype.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:99)
at backtype.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:80)
at backtype.storm.disruptor$consume_loop_STAR_$fn__759.invoke(disruptor.clj:94)
at backtype.storm.util$async_loop$fn__458.invoke(util.clj:463)
at clojure.lang.AFn.run(AFn.java:24)
at java.lang.Thread.run(Thread.java:745)

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