Currently facing an issue with suro communicating with s3

ERROR [com.netflix.suro.input.thrift.MessageSetProcessor] Failed to process message routingKey: logs, payload byte size: 324: null
java.lang.NullPointerException
  at com.netflix.suro.routing.MessageRouter.process(MessageRouter.java:84)
  at com.netflix.suro.input.thrift.MessageSetProcessor.processMessageSet(MessageSetProcessor.java:235)
  at com.netflix.suro.input.thrift.MessageSetProcessor.access$300(MessageSetProcessor.java:57)
  at com.netflix.suro.input.thrift.MessageSetProcessor$1.run(MessageSetProcessor.java:210)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at java.lang.Thread.run(Thread.java:745)

any idea why?