Im getting the same message as you guys, seems to be a crash from the main quest:
[14:42:19.7720639] SandBox.GauntletUI.GauntletKingdomScreen::HandleResume
[14:42:27.8854013] Unify the Empire: Log updated.
[14:42:27.9073439] Quest Completed: Unify the Empire
[14:42:27.9791534] Stop Sound Event 757
[14:42:27.9821147] Stop Sound Event 756
[14:42:27.9851060] Stop Sound Event 755
[14:42:56.1718118] Exception occurred inside invoke: ExecuteFinalSelection
Target type: TaleWorlds.CampaignSystem.ViewModelCollection.KingdomManagement.KingdomDecision.DecisionTypes.SettlementDecisionVM
Argument count: 0
Inner message: An item with the same key has already been added.