[SOLVED] Double XP script not working when I kill NPC?!?! Anyone help?

I've been trying to add a double experience script for hours and i've yet to figure out how it works ...If anyone could help it would be greatly appreciated!

local GamePassService = game:GetService("GamePassService")
local GamePassId = 989673709

local Humanoid = script.Parent.Humanoid
local Player = game.Players.LocalPlayer

function PwntX_X()
    local tag = Humanoid:FindFirstChild("creator")
    if tag ~= nil then
        if tag.Value ~= nil then
            local Leaderstats = tag.Value:FindFirstChild("leaderstats")
            if Leaderstats ~= nil then
                Leaderstats.XP.Value = Leaderstats.XP.Value + 25
            elseif GamePassService:PlayerHasPass(Player, GamePassId) then
                if Leaderstats ~= nil then
                    Leaderstats.XP.Value = Leaderstats.XP.Value + 50
                end
                wait(0.1)
                script:Remove()
            end
        end
    end
end

Humanoid.Died:Connect(PwntX_X)