If player has a forcefield then show it on text, but when forcefield is removed i get an error?

I have a script in a Gui that tells the player if they have a forcefield on screen. The problem i have is once the forcefield is removed, i get an error instead of making the text invisible.
Error: ForceField is not a valid member of Model.

local player = script.Parent.Parent.Parent.Parent.Parent.Parent.Character

while true do
    wait(1)
    if player.ForceField then
        script.Parent.Visible = true
        script.Parent.Text = "ForceField"
    else
        script.Parent.Visible = false
    end
end

Any help pls?