[ANSWERED] Made a script that kicks you after 30 mins of idle, anything wrong?

Script:

local count = 0
local player = script.Parent.Parent
local character = player.Character
local humanoid = character:WaitForChild("Humanoid")
local beginTimer = false

humanoid.Running:Connect(function(speed)
	if speed > 0 then
		count = 0
		beginTimer = false
		print("Moving!")
	elseif speed == 0 then
		beginTimer = true
		print("Stopped!")
	end
end)

while true do
	wait(1)
	if beginTimer == true then
		count += 1
		print("Count: ", count)
		if count == 10 then
			player:Kick("You were kicked for being idle 30+ minutes.")
		end
	end
end

By the way I reduced the numbers for testing. I got the error: Players.RedstonePlayz09.PlayerScripts.IdleKickScript:4: attempt to index nil with 'WaitForChild' (This is a script inside a StarterPlayerScripts)