I was decom an econ starbase to make room for a culture/influence starbase & clicked the decom button 2x without getting the are you sure message so hit the button to go back to themain map.  when I got back to the main map I got the are you sure you want to decom message 2x, hit yes each time & ctd the second.  probably a one off random thing since I never encountered it before, but don't decom sb often either 

Debug Message: Player 86 CompleteResearch tech Missile Weapons originalResearcher 0
Debug Message: Research Complete [PlayerID 86, Missile Weapons]
Debug Message: ApplyTradeItem giverID 106 receiverID 90
Debug Message: Player 90 CompleteResearch tech Enhanced Production originalResearcher 0
Debug Message: Research Complete [PlayerID 90, Enhanced Production]
Debug Message: ApplyTradeItem giverID 90 receiverID 106
Debug Message: Player 106 CompleteResearch tech Shield Specialization originalResearcher 0
Debug Message: Research Complete [PlayerID 106, Shield Specialization]
Debug Message: ApplyTradeItem giverID 110 receiverID 90
Debug Message: Player 90 CompleteResearch tech Trade Route Optimization originalResearcher 0
Debug Message: Research Complete [PlayerID 90, Trade Route Optimization]
Debug Message: ApplyTradeItem giverID 90 receiverID 110
Debug Message: Player 110 CompleteResearch tech Xeno Entertainment originalResearcher 0
Debug Message: Research Complete [PlayerID 110, Xeno Entertainment]
Debug Message: ApplyTradeItem giverID 116 receiverID 90
Debug Message: Player 90 CompleteResearch tech Improved Logistics originalResearcher 0
Debug Message: Research Complete [PlayerID 90, Improved Logistics]
Debug Message: ApplyTradeItem giverID 90 receiverID 116
Debug Message: Player 116 CompleteResearch tech Militarization originalResearcher 0
Debug Message: Research Complete [PlayerID 116, Militarization]
Debug Message: Popup Manager Update: Unhiding ConversationPopupWnd
Debug Message: OnConversationResponse playerIndex: 52 playerIndex: 0
Debug Message: CMobileListener::CMobileObjEvent_InitiateEjectShipsFromStation station 28080
Debug Message: Popup Manager Update: Unhiding StarbaseWnd
Debug Message: Popup Manager Update: Unhiding StarbaseWnd
Debug Message: Popup Manager Update: Unhiding MessageBoxWnd
Debug Message: Popup Manager Update: Unhiding MessageBoxWnd
Debug Message: CMobileListener::OnDecommission shipOrFleet 28080
Debug Message: Starbase Destroyed. [ID 28080]
Debug Message: Popup Manager Update: Unhiding MessageBoxWnd
Debug Message: CMobileListener::OnDecommission shipOrFleet 28080