Why won't this script work when I reset?

This script works perfectly, but when I reset my character it stops working.

Any idea why?

This script is a Local Script in the StarterGui, by the way.

Here's my code:

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

local selection = Instance.new("SelectionBox",player.PlayerGui)
selection.Color = BrickColor.new("Medium stone grey")

repeat wait() until player.Character
local character = player.Character
local valid_target = character.valid_target
local current_target = character.current_target

mouse.Icon = "http://www.roblox.com/asset/?id=187412806"
mouse.Move:connect(function()
	local target = mouse.Target
	if target ~= nil and current_target.Value ~= target.Parent then
		local hum = target.Parent:FindFirstChild("Humanoid")
		local enemy = target.Parent:FindFirstChild("enemy")
		local player = target.Parent:FindFirstChild("player")
		local book = target.Parent:FindFirstChild("book")
		local friend = target.Parent:FindFirstChild("friend")
		if hum and target.Parent:IsA("Model") and not player and enemy then
			mouse.Icon = "http://www.roblox.com/asset/?id=187412859"
			selection.Adornee = target.Parent
			valid_target.Value = true
		elseif hum and target.Parent:IsA("Model") and not player and book then
			mouse.Icon = "http://www.roblox.com/asset/?id=187412830"
			selection.Adornee = target.Parent
			valid_target.Value = true
		elseif hum and target.Parent:IsA("Model") and not player and friend then
			mouse.Icon = "http://www.roblox.com/asset/?id=187412846"
			selection.Adornee = target.Parent
			valid_target.Value = true
		elseif hum and target.Parnet:IsA("Model") and player then
			mouse.Icon = "http://www.roblox.com/asset/?id=187412806"
			selection.Adornee = target.Parent
			valid_target.Value = true
		elseif not hum then
			mouse.Icon = "http://www.roblox.com/asset/?id=187412806"
			selection.Adornee = nil
			valid_target.Value = false
		end
	else
		mouse.Icon = "http://www.roblox.com/asset/?id=187412806"
		selection.Adornee = nil
		valid_target.Value = false
	end
end)