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java.lang.NullPointerException at scala.collection.immutable.HashSet.union(HashSet.scala:89) at scala.collection.immutable.HashSet.union(HashSet.scala:35) at akka.stream.impl.StreamLayout$Module$class.compose(StreamLayout.scala:282) at akka.stream.impl.StreamLayout$CompositeModule.compose(StreamLayout.scala:416) at akka.stream.impl.StreamLayout$Module$class.fuse(StreamLayout.scala:194) at akka.stream.impl.StreamLayout$CompositeModule.fuse(StreamLayout.scala:416) at akka.stream.scaladsl.Flow.toMat(Flow.scala:109) at akka.stream.scaladsl.Flow.to(Flow.scala:80) at akka.stream.javadsl.Flow.to(Flow.scala:149) at com.tradeshift.reaktive.replication.DataCenterForwarder.filteredDataCenterSink(DataCenterForwarder.java:188) at com.tradeshift.reaktive.replication.DataCenterForwarder.lambda$2(DataCenterForwarder.java:114) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21) at scala.PartialFunction$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)