Why is the script breaking?

Sometimes this script break, how could it not? This was made by Nikilis by the way.

local TimeBetweenJumps = .5;
local Player = game.Players.LocalPlayer
repeat wait() until Player.Character ~= nil;
local Character = Player.Character
--repeat wait() until Character:FindFirstChild("Humanoid")
local Humanoid = Character:WaitForChild("Humanoid");
local LastJump = time();
Humanoid.Changed:connect(function()
    if Humanoid.Jump then
        if time()-LastJump >= TimeBetweenJumps then
            LastJump = time();
        else
            Humanoid.Jump = false;
        end
    end
end)