Had Endless Legend kick up this error message.

NullReferenceException: Object reference not set to an instance of an object
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PirateCouncil.UpdateUniqueFacilitiesOwned (.PointOfInterest facility)
PirateCouncil.UnlockFacility (.PointOfInterest facility)
PirateCouncil.UpdateFortressesState ()
PirateCouncil+<GameClientState_Turn_Begin_UpdateFortressesState>c__Iterator26E.MoveNext ()
Amplitude.Coroutine.Run ()
GameClientState_Turn_Begin.Run ()
Amplitude.Unity.Framework.FiniteStateMachine.Update ()
GameInterface.Update ()
Session.Update ()
Amplitude.Unity.Session.SessionManager.LateUpdate ()

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V1.5.7 S3  (64-bit)

Still able to play this particular game but after every turn it puts the error up.

Thank you for reporting this!

Do you also happen to have the savegame file, where this error occurred?

If yes, can you please upload it?