Whenever I kill this npc, it won't give me exp. I think something is wrong with my weapon?.

So, I'm a pretty new scripter and im making a script where the player kills an npc, he or she gains Exp and that exp can used to lvl up and unlock new fighting styles which hit more and harder, I feel like the problem is my weapon because it is a combat weapon that has fighting moves and animations and all that a combat system has, how would I make this script work for the player so when they kill the npc, they gain Exp

local Humanoid = script.Parent.Humanoid

function Dead()
    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.Exp.Value = leaderstats.Exp.Value + 10
                wait(0.1)
                script:Remove()
            end
        end
    end
end
Humanoid.Died:Connect(Dead)