AbstractPartialFunction throws NPE

Hi,
After rebuilding Play 2.0 with Scala virtualized (which follows very closely master) I ran tests and got:
java.lang.NullPointerException: null at scala.runtime.AbstractPartialFunction.orElse(AbstractPartialFunction.scala:41) ~[scala-library.jar:0.11.2] at akka.routing.Router$class.receive(Routing.scala:130) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RouterConfig$$anon$1.receive(Routing.scala:85) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.actor.Actor$class.$init$(Actor.scala:291) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RouterConfig$$anon$1.<init>(Routing.scala:85) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RouterConfig$class.createActor(Routing.scala:85) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RoundRobinRouter.createActor(Routing.scala:204) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RoutedActorRef$$anonfun$$init$$1.apply(Routing.scala:19) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.routing.RoutedActorRef$$anonfun$$init$$1.apply(Routing.scala:19) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.actor.ActorCell.newActor(ActorCell.scala:340) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.actor.ActorCell.create$1(ActorCell.scala:357) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:210) ~[akka-actor-2.0-M2.jar:2.0-M2] at akka.dispatch.Mailbox.run(Mailbox.scala:164) ~[akka-actor-2.0-M2.jar:2.0-M2]
The relevant line is: https://github.com/scala/scala/blob/master/src/library/scala/runtime/AbstractPartialFunction.scala#L41
By analyzing this line it looks like it is result that must be null, right? I don't have any small test-case reproducing this problem but I guess Akka guys could come up with something fairly quickly.
--
Grzegorz Kossakowski

Is https://issues.scala-lang.org/browse/SI-5300 related? I can't check right now whether that fix is in M1.