MNTR: NullRefeferencException inside Throttler #7564
Description
Version Information
Version of Akka.NET? 1.5.39
Which Akka.NET Modules? Akka.Remote / Akka.Remote.TestKit
Describe the bug
Hit the following NRE while working on troubleshooting DistributedPubSubRestartSpecs:
[ERROR][03/23/2025 12:53:13.315Z][Thread 0006][akka://DistributedPubSubRestartSpec/system/transports/throttlermanager.$gremlin.tcp$1/throttler1] Object reference not set to an instance of an object.
Cause: System.NullReferenceException: Object reference not set to an instance of an object.
at Akka.Actor.ActorRefBase.Equals(IActorRef other) in E:\Repositories\olympus\akka.net\src\core\Akka\Actor\ActorRef.cs:line 405
at Akka.Actor.ActorCell.RemWatcher(IActorRef watchee, IActorRef watcher) in E:\Repositories\olympus\akka.net\src\core\Akka\Actor\ActorCell.DeathWatch.cs:line 267
at Akka.Actor.ActorCell.SysMsgInvokeAll(EarliestFirstSystemMessageList messages, Int32 currentState) in E:\Repositories\olympus\akka.net\src\core\Akka\Actor\ActorCell.DefaultMessages.cs:line 288
Expected behavior
Either null shouldn't be passable here or the method should be able to handle it.
Actual behavior
NRE.