Animation won't stop even when told to on unequipping a tool? [Read Desc]

I am making a game which involves me to have a animation when the tool isn't used when its equipped. However while I have gotten the equipping animation down when I unequip the tool it wont stop. In the output it says "attempt to call a nil value." Again I'm not wanting a remodel of the script I want to know how to fix it.

The script:

local deb= false
local timeLength= 1
local photographer = game.Players.LocalPlayer
local AnimationID = script.ID.Value
local tool = script.Parent
Humanoid = photographer.Character.Humanoid


function onActivation()
    if deb == false then deb = true
    Humanoid.WalkSpeed = 0
    game.ServerScriptService.Events.AddPhotos:FireServer()
    local animation = Instance.new("Animation")
    animation.Name = "Shoot"
    animation.Parent = photographer
    animation.AnimationId = "http://www.roblox.com/Asset?ID=2225545721"
    local animTrack = Humanoid:LoadAnimation(animation)
    animTrack:Play()
wait(0.4)
animTrack:Destroy()
Humanoid.WalkSpeed = 16
    wait(1)
    deb = false
    else end
end
function onEquipped()
local anim = Instance.new("Animation")
    anim.Name = "Idle"
    anim.AnimationId = "rbxassetid://"..AnimationID
    local h = Humanoid:LoadAnimation(anim)
    h:Play()
    function unEquipped()
        h:Stop()
    end
    end
script.Parent.Equipped:Connect(onEquipped)
script.Parent.Unequipped:Connect(unEquipped)
script.Parent.Activated:Connect(onActivation)

If anyone knows the reason can you please help. Thanks.