How do I detect if a player sat down using a script?

I want to detect if a player sat down using a script. I already made a script, but it does not work. The script is a local script and is in StarterPlayerScripts.

Here is the script:

local character = script.Parent
local humanoid = character:WaitForChild("Humanoid")

humanoid.Seated:Connect(function(isSeated, seat)
    if isSeated then
        if seat then
            print ("The player is now sitting in the seat named "..seat.Name.."!")
        end
    else
        print("The player is no longer sitting!")
    end
end)

Here is the output: https://gyazo.com/4345128bdec21acf91c73aa25fb105aa