Got a little message for ya to figure out.

NullReferenceException: Object reference not set to an instance of an object

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AILayer_Attitude.FortressSwap (.Fortress fortress, Int32 oldOwnerEmpireIndex, Int32 newOwnerEmpireIndex)

AILayer_Attitude.OnFortressEventRaised (Amplitude.Unity.Event.Event raisedEvent)

AILayer_Attitude.EventService_EventRaise (System.Object sender, Amplitude.Unity.Event.EventRaiseEventArgs e)

Amplitude.Unity.Event.EventManager.Notify (Amplitude.Unity.Event.Event notification)

DepartmentOfTheInterior.SwapFortressOccupant (.Fortress fortress, .Empire newOccupyingEmpire, Boolean hasBeenExchanged, System.Object[] parameters)

DepartmentOfTheInterior.SwapFortressOccupant (.Fortress fortress, .Empire newOccupyingEmpire, System.Object[] parameters)

DepartmentOfTheInterior+<SwapFortressOccupantProcessor>c__Iterator22E.MoveNext ()

Amplitude.Coroutine.Run ()

GameClient.ProcessOrders ()

GameInterface.UpdateMessageBoxAndProcessOrders ()

GameClient.UpdateMessageBoxAndProcessOrders ()

Session.Update ()

Amplitude.Unity.Session.SessionManager.LateUpdate ()

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V1.5.1 S3  (64-bit)

Thanks for reporting this.

Do you happen to have a savegame file, where this error occurred ? This way, it's much easier for the devs to find a solution ^^

I do, the game runs just fine, not sure off the top of my head how to get the save file you.

Just reply to my post, then use the "Upload file" button (it has a file icon, between a video camera and a table ^^).

Wild Walkers .zip here ya go.