Any idea why this might happen?
`
[ERROR] [01/21/2015 13:54:52.688] [GatlingSystem-akka.actor.default-dispatcher-6] [akka://GatlingSystem/user/$k/$a] null
java.lang.NullPointerException
at io.gatling.core.structure.Loops$$anonfun$5$$anonfun$apply$4.apply(Loops.scala:58)
at io.gatling.core.structure.Loops$$anonfun$5$$anonfun$apply$4.apply(Loops.scala:58)
at io.gatling.core.validation.Success.map(Validation.scala:32)
at io.gatling.core.structure.Loops$$anonfun$5.apply(Loops.scala:58)
at io.gatling.core.structure.Loops$$anonfun$5.apply(Loops.scala:58)
at io.gatling.core.session.LoopBlock$.continue(Block.scala:38)
at io.gatling.core.action.InnerLoop.execute(Loop.scala:61)
at io.gatling.core.action.Action$$anonfun$receive$1.applyOrElse(Actions.scala:29)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at io.gatling.core.akka.BaseActor.aroundReceive(BaseActor.scala:23)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
13:54:52.694 [ERROR] i.g.c.a.InnerLoop - Action InnerLoop crashed on session Some(Session(Production Simulation (Surveys),
`
