Pretty much the question explains everything
Script:
script.Parent.Touched:connect(function(hit)
local player = game.Players:GetPlayerFromCharacter(hit.Parent)
local Victories = player.leaderstats.Victories
local human = hit.Parent:FindFirstChild("Humanoid")
if human.Sit then
local sound = Instance.new("Sound",game.Workspace.Objects.Sounds)
sound.SoundId = "rbxasset://sounds/victory.wav"
sound.MaxDistance = 10.000
sound:Play()
Victories.Value = Victories.Value + 1
human.Sit = false
wait(2)
sound:Destroy()
end
end)

2 comments
Why not put line 6 before line 2? It's already defined for to search for the asset. To add, however, the problem at hand isn't necessarily the Humanoid, but in this case, it's that "player" may not be a player, and thus the error; either that, or "hit.Parent" returned nil.
Thanks :)