Why does it say CurrentCard is nil?

EDIT: So I believe that somewhere where i passed the CurrentCard variable through the fire function, i messed up. But im not sure where and how.

--Local Script
parent:WaitForChild("Confirm").MouseButton1Click:connect(function() -- Confirm button
	if Role == "Czar" then
		if PlayerPicking == false and confirmed == false then
			-- Code dis
		end
	else
		if PlayerPicking == true and confirmed == false and CurrentCard then
			local CardText = CurrentCard.Text
			print(CurrentCard) --Its not nil here yet
			game.ReplicatedStorage.SelectorConfirm:FireServer(Player,CurrentCard, CardText) -- possible point of mistake
			CurrentCard.Visible = false
			confirmed = true
		end
	end

--Server Script
PickedRoundCards = {}			
			for i, player in pairs(PlayingPlayers) do
				game.ReplicatedStorage.SelectorConfirm.OnServerEvent:connect(function(Player,CurrentCard, CardText)
					print(CurrentCard) -- its nil here??????
					table.insert(PickedRoundCards,CurrentCard)
					game.ReplicatedStorage.AddTurnedOverCard:FireAllClients(PickedRoundCards,CurrentCard)
				end)
			end

Extra code:

	local CardSelected = false
	local LastCard = nil
	
	for i, card in pairs(parent:WaitForChild("PersonalCards"):GetChildren()) do -- Card Click function
		card.MouseButton1Click:connect(function()
			CardSelected = true
			CurrentCard = card
			if LastCard ~= CurrentCard or nil then
				if LastCard ~= nil then
					LastCard:TweenSizeAndPosition(UDim2.new(LastCard.Size.X.Scale-.01,0,LastCard.Size.Y.Scale-.01,0),UDim2.new(LastCard.Position.X.Scale+.005,0,LastCard.Position.Y.Scale+.005,0),"InOut","Linear",.1,true)
				end
				card:TweenSizeAndPosition(UDim2.new(card.Size.X.Scale+.01,0,card.Size.Y.Scale+.01,0),UDim2.new(card.Position.X.Scale-.005,0,card.Position.Y.Scale-.005,0),"InOut","Linear",.1,true)
				LastCard = card
				print(CurrentCard)
			end
		end)
	end

game.ReplicatedStorage.AddTurnedOverCard.OnClientEvent:connect(function(PickedRoundCards)
	local CardOwner = CurrentCard.Parent.Parent.Parent.Parent -- Line where it errors
	local CardClone = CurrentCard:Clone()
	CardClone.Parent = script.Parent.Background
	CardClone.Name = CardOwner.Name
	CardClone.Size = UDim2.new(.102,0,.278,0)