Received the following when assigning an admiral to a naval fleet.

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

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ArmyCommanderPanel.ValidateHeroChoice (.Unit hero)

UnityEngine.GameObject:SendMessage(String, Object)

HeroSelectionModalPanel:OnSelectCB(GameObject)

UnityEngine.GameObject:SendMessage(String, Object, SendMessageOptions)

AgeControlButton:MouseUp(AgeMouseEventData)

UnityEngine.Component:SendMessage(String, Object)

AgeManager:LateUpdate()

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V1.5.1 S3  (64-bit)