How do I remove the player's force field? [ANSWERED] [closed]

How do I remove the player's force field without breaking when the player doesn't have a force field?

local animation = Instance.new('Animation')
local animTrack
local debounce = false
local player = game.Players.LocalPlayer.Character

function onEquip()
   script.Parent.Handle.UnsheathSound:Play()
end

function onActivate()
    if not debounce then
    debounce = true
    player.ForceField:Destroy()
    animation.AnimationId = "http://www.roblox.com/asset/?id=129967390"
    animTrack = player.Humanoid:LoadAnimation(animation)
    animTrack:Play()
    script.Parent.Handle.SlashSound:Play()
    script.Parent.Handle.Script.Disabled = false
    wait(0.5)
    animTrack:Stop()
    script.Parent.Handle.Script.Disabled = true
    wait(0.5)
    debounce = false
    end
end

function onUnequip()
    animTrack:Stop()
end

script.Parent.Equipped:connect(onEquip)
script.Parent.Unequipped:connect(onUnequip)
script.Parent.Activated:connect(onActivate)