LocalAnimation requires the Humanoid object?

Inside of a script for a skill, and animation is triggered, and it works until the player resets or dies. After they die, I get this message:

This is how it works normally.

Any ideas?

local Player = game.Players.LocalPlayer 
local mouse = Player:GetMouse() 
local lastUse = 0;
local char = Player.Character or Player.CharacterAdded:Wait()
local hum = char:WaitForChild("Humanoid")


local function onKeyDown(key) 
    local Key = key:lower()
    if key == "z" and Player.Levelss.Level.Value >= 15 and tick()-lastUse > 10 and Player.Levelss.RangedPunch.Value < 1  then
	    lastUse = tick();  
        local x = Instance.new("Part")
        x.BrickColor = BrickColor.new("White")
        x.Material = "Neon"
        x.CanCollide = false
        x.Transparency = 0.6
        x.Size = Vector3.new(10,10,10)
        x.TopSurface = "Smooth"
        x.BottomSurface = "Smooth"
        x.Shape = "Ball"
        x.Name = Player.Name
        local fd = script.fireDamage:clone()
        fd.Parent = x
        local a = Instance.new("Sound")
        a.SoundId = "http://www.roblox.com/asset/?id=260430117"
        a.Parent = x
        a.Volume = 2
        a:play()

 
       
        local animTrack = hum:LoadAnimation(script.Punch)
        animTrack:Play()
        wait(0.7)
        animTrack:Stop()



        Player.Levelss.XP.Value = Player.Levelss.XP.Value + 8


        local y = Instance.new("BodyVelocity")
        y.maxForce = Vector3.new(math.huge ,math.huge ,math.huge)
        y.velocity = Player.Character.Torso.CFrame.lookVector*95

        x.CFrame = Player.Character.Torso.CFrame*CFrame.new(0, 1 , -10)
        x.Parent = Workspace
        y.Parent = x    
        game.Debris:AddItem(x, 6)

        
    end
end


mouse.KeyDown:connect(onKeyDown)

Your solution sort of works, cabbler. But I still get this error message :l