Why is the player nil when I call a GUI?

When I try to call a GUI, the output's nil, but when I try to print something it works. Here is the code:

p = script.Parent.Position
range = 500-- the range
frame = game.Players.LocalPlayer.PlayerGui.ScreenGui.Frame

while true do
    wait(.1)
    plrs = game.Players:GetChildren()
    for i,plr in ipairs(plrs) do
        if plr.Character ~= nil then
            tor = plr.Character.UpperTorso
            if (p - tor.Position).magnitude <= range then
				print("yay") 
               frame.Visible = true
			else
				frame.Visible = false 
            end
        end
    end
end

Thanks for the Help!