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java.lang.NullPointerException at scala.collection.immutable.HashSet$HashTrieSet.iterator(HashSet.scala:965) at scala.collection.immutable.HashSet$HashTrieSet.iterator(HashSet.scala:517) at akka.stream.impl.fusing.Fusing$.akka$stream$impl$fusing$Fusing$$descend(Fusing.scala:366) at akka.stream.impl.fusing.Fusing$.doAggressive(Fusing.scala:44) at akka.stream.impl.fusing.Fusing$.aggressive(Fusing.scala:34) at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:144) at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:138) at akka.stream.scaladsl.RunnableGraph.run(Flow.scala:351) at akka.stream.scaladsl.Source.runWith(Source.scala:81) at akka.stream.javadsl.Source.runWith(Source.scala:521) at com.tradeshift.reaktive.replication.DataCenterForwarder.lambda$2(DataCenterForwarder.java:117) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21) at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123) at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21) at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170) at akka.actor.Actor$class.aroundReceive(Actor.scala:484)