Hello i'am doing game where you can earn money but i can't do plot selecting roblox give me error: Workspace.function.ClaimPlotScript:31: attempt to index nil with 'Owner'

In every plot i have value that name is owner where i wan't to put with script player's username that claim's it

There's my scripts(local and server):

Server script:

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local WorkSpace = game.Workspace
local ClaimEvent = ReplicatedStorage.ClaimEvent
local AlreadyClaimedEvent = ReplicatedStorage.AlreadyClaimedEvent
local HideGUI = ReplicatedStorage.HideGUIEvent
local Plots = WorkSpace.Plots
local SelectedPlot = nil


local function ClaimPlot(username, PlotSelect)
	print("Remote event ClaimPlot has been received.")
	if PlotSelect == 1 then
		SelectedPlot = Plots.firstplot
	elseif PlotSelect == 2 then
		SelectedPlot = Plots.secondplot
	elseif PlotSelect == 3 then
		SelectedPlot = Plots.thirdplot
	elseif PlotSelect == 4 then
		SelectedPlot = Plots.fourthplot
	elseif PlotSelect == 5 then
		SelectedPlot = Plots.fifthplot
	elseif PlotSelect == 6 then
		SelectedPlot = Plots.sixthplot
	elseif PlotSelect == 7 then
		SelectedPlot = Plots.seventhplot
	elseif PlotSelect == 8 then
		SelectedPlot = Plots.eightplot
	end
	
	local PlotValue = SelectedPlot.Owner.Value
	
	if PlotValue ~= nil then
		PlotValue = username
		HideGUI:FireClient(username)
	else
		AlreadyClaimedEvent:FireClient(username)
	end
	warn("ServerEvent completed!")

end


ClaimEvent.OnServerEvent:Connect(ClaimPlot)

Local script:

local gui = script.Parent.Parent
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local ClaimEvent = ReplicatedStorage:WaitForChild("ClaimEvent")
local AlreadyClaimedEvent = ReplicatedStorage:WaitForChild("AlreadyClaimedEvent")
local HideGUIEvent = ReplicatedStorage:WaitForChild("HideGUIEvent")
local username = game.Players.LocalPlayer
local PlotSelect = "sixthplot"


script.Parent.MouseButton1Click:Connect (function(username)
	ClaimEvent:FireServer(username, PlotSelect)
	warn("Mouseclick sended to event")
end)


local function AlreadyClaimed()
	print("AlreadyClaimed event has been received.")
	game.StarterGui.alrdclaimed.Enabled = true
	wait(3)
	game.StarterGui.alrdclaimed.Enabled = false
end

local function hideGUI()
	gui.Visible = false
end

HideGUIEvent.OnClientEvent:Connect(hideGUI)
AlreadyClaimedEvent.OnClientEvent:Connect(AlreadyClaimed)
Anonymous