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

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This exception has no message.
java.lang.NullPointerException:
at io.gatling.metrics.sender.TcpSender.askForConnection(TcpSender.scala:99)
at io.gatling.metrics.sender.TcpSender$$anonfun$3.io$gatling$metrics$sender$TcpSender$$anonfun$3$$$anonfun$1(TcpSender.scala:54)
at io.gatling.metrics.sender.TcpSender$$nestedInAnonfun$3$lambda$$applyOrElse$1.apply(TcpSender.scala:54)
at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:126)
at akka.actor.LightArrayRevolverScheduler$TaskHolder.run(LightArrayRevolverScheduler.scala:340)
at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(LightArrayRevolverScheduler.scala:144)
at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(LightArrayRevolverScheduler.scala:143)
at scala.collection.Iterator$class.foreach(Iterator.scala:893)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at akka.actor.LightArrayRevolverScheduler.close(LightArrayRevolverScheduler.scala:142)
at akka.actor.ActorSystemImpl.stopScheduler(ActorSystem.scala:712)
at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply$mcV$sp(ActorSystem.scala:646)
at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply(ActorSystem.scala:646)
at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply(ActorSystem.scala:646)
at akka.actor.ActorSystemImpl$$anon$3.run(ActorSystem.scala:662)
at akka.actor.ActorSystemImpl$TerminationCallbacks$$anonfun$addRec$1$1.applyOrElse(ActorSystem.scala:840)
at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:436)
at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:435)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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