Point giving script not working?

This script is supposed to give a team points every second for holding down a certain point. The "Owner" value (an ObjectValue) is nil until someone claims it, and that one person's name becomes the value of the "Owner" value.

The script is then supposed to find the team of the "Owner" and give his/her team points every second.

However, the script doesn't work. I received output, however.

Output: 12:35:50.999 - Argument 1 missing or nil 12:35:51.000 - Script 'Workspace.Map.KotH.PointGiver', Line 15

Script:

local DD = game.ServerScriptService.MainGameScript.Variables:WaitForChild("DD")
local GG = game.ServerScriptService.MainGameScript.Variables:WaitForChild("GG")
local BB = game.ServerScriptService.MainGameScript.Variables:WaitForChild("BB")
local RR = game.ServerScriptService.MainGameScript.Variables:WaitForChild("RR")

repeat 
wait()
until script.Parent:findFirstChild("Owner")

while true do
	local Dude = game.Players:FindFirstChild(script.Parent.Owner.Value)
	if game.ServerScriptService.MainGameScript.Variables.Playing.Value == true then
		if game.ServerScriptService.MainGameScript.Variables.GameMode.Value == "King of the Hill" then
			if Dude ~= nil then
				if Dude.TeamColor == BrickColor.new("Bright green") then
					GG.Value = GG.Value + 1
				elseif Dude.TeamColor == BrickColor.new("Bright red") then
					RR.Value = RR.Value + 1
				elseif Dude.TeamColor == BrickColor.new("Bright blue") then
					BB.Value = BB.Value + 1	
				elseif Dude.TeamColor == BrickColor.new("Bright yellow") then
					DD.Value = DD.Value + 1	
				end			
			end
		end
	end
	wait(1)
end

The Object value is being set to the player itself, yet you try to use game.Players:FindFirstChild on the object value?

Either do:

local Dude = game.Players:FindFirstChild(script.Parent.Owner.Value.Name)

or just grab the value directly and do:

local Dude = script.Parent.Owner.Value

Also the error suggests that you're trying to access the owner when there is no value set, so I'd add an if statement to make sure that Owner.Value ~= nil