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)