Error shows up when I try to check player's name. click detector?

I am trying to make a house owning script. But a error shows up when I try.

Error: "18:01:35.064 - Workspace.House1.Door.Script:20: attempt to index field 'Value' (a nil value)"

Script:

local occupied = false
local price = 500000

script.Parent.ClickDetector.MouseClick:connect(function(player)
	repeat
		wait()
	until player.Character
	if player:WaitForChild("HouseObject").Value == nil then
		if occupied == false then
			if game:GetService("ServerStorage"):WaitForChild("Data"):WaitForChild(player.Name.."Cash").Value >= price then
				script.Parent.PlayerObject.Value = player
				player:WaitForChild("HouseObject").Value = script.Parent.Parent
				occupied = true
				game:GetService("ServerStorage"):WaitForChild("Cash").Value = game:GetService("ServerStorage"):WaitForChild("Cash").Value -price
				print(player.Name.." bought a house.")
			end
		end
	end
	wait(.1)
	if player.Name == script.Parent.PlayerObject.Value.Name then
		script.Parent.CanCollide = false
		wait(3)
		script.Parent.CanCollide = true
	else
		script.Parent.CanCollide = true
	end
end)

game.Players.PlayerRemoving:connect(function(player)
	script.Parent.PlayerObject.Value = nil
	player:WaitForChild("HouseObject").Value = nil
	occupied = false
end)