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

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NPE in dataflow pipeline at SourceOperationExecutor.isSplitOperationTooLargeForDataflowService

This exception has no message.

java.lang.NullPointerException: 	at com.google.cloud.dataflow.sdk.runners.worker.SourceOperationExecutor.isSplitOperationTooLargeForDataflowService(SourceOperationExecutor.java:100)	at com.google.cloud.dataflow.sdk.runners.worker.SourceOperationExecutor.isSplitResponseTooLarge(SourceOperationExecutor.java:92)	at com.google.cloud.dataflow.sdk.runners.worker.DataflowWorker.doWork(DataflowWorker.java:227)	at com.google.cloud.dataflow.sdk.runners.worker.DataflowWorker.getAndPerformWork(DataflowWorker.java:146)	at com.google.cloud.dataflow.sdk.runners.worker.DataflowWorkerHarness$WorkerThread.doWork(DataflowWorkerHarness.java:164)	at com.google.cloud.dataflow.sdk.runners.worker.DataflowWorkerHarness$WorkerThread.call(DataflowWorkerHarness.java:145)	at com.google.cloud.dataflow.sdk.runners.worker.DataflowWorkerHarness$WorkerThread.call(DataflowWorkerHarness.java:132)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)