java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.mirth.connect.connectors.mllp.MllpMessageReceiver$TcpWorker.generateACK(MllpMessageReceiver.java:543)
at com.mirth.connect.connectors.mllp.MllpMessageReceiver$TcpWorker.processHL7Data(MllpMessageReceiver.java:509)
at com.mirth.connect.connectors.mllp.MllpMessageReceiver$TcpWorker.processData(MllpMessageReceiver.java:431)
at com.mirth.connect.connectors.mllp.MllpMessageReceiver$TcpWorker.run(MllpMessageReceiver.java:348)
at org.mule.impl.work.WorkerContext.run(WorkerContext.java:290)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)
at java.lang.Thread.run(Thread.java:662)

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