Script doesn't work after player dies?

So here is the problem after the player dies my "Fireball" script stops working.. Script:

    local Player = game.Players.LocalPlayer

local Character = Player.Character or Player.CharacterAdded:wait()

local Ready = true

function onKeyPress(actionName, userInputState, inputObject)

if userInputState == Enum.UserInputState.Begin and Ready then

Ready = false

local FireBall = game.ReplicatedStorage.FireBall

local FireBallClone = FireBall:Clone()

FireBallClone.Parent = game.Workspace

FireBallClone.CFrame = Character.HumanoidRootPart.CFrame*CFrame.new(0, 1, -3)

local PV = Instance.new("BodyVelocity")

PV.MaxForce = Vector3.new(math.huge, math.huge, math.huge)

PV.Velocity = Character.HumanoidRootPart.CFrame.lookVector*30

PV.Parent = FireBallClone

local Debounce = true

FireBallClone.Touched:connect(function(part)

if part.Parent:FindFirstChild("Humanoid") and Debounce then

part.Parent.Humanoid:TakeDamage(25)

Debounce = false

end

end)

wait(1.5)

Ready = true

wait(0.5)

FireBallClone:Destroy()

 end

 end

game.ContextActionService:BindAction("keyPress", onKeyPress, false, Enum.KeyCode.E)

Here's the output after dying

HumanoidRootPart is not a valid member of Model

08:57:33.478 - Stack Begin

08:57:33.479 - Script 'Players.Blob_y.PlayerScripts.LocalScript', Line 16

08:57:33.479 - Stack End

08:57:33.480 - ContextActionService: Unexpected error while invoking callback: HumanoidRootPart is not a valid member of Model

New to scripting any help would be appreciated