why is my object value not storing my player ?

my object value is nil/ blank

local tool = script.Parent
local name = tool.Parent.Parent.Name
local anim = 1
local attack = true
local mid = false
local KOValue = "Kills"
local damage = 50
tool.Equipped:Connect(function()

    _G.player = game.Players:GetPlayerFromCharacter(tool.Parent)
    _G.Character = _G.player.Character
    _G.Character.Animate.run.RunAnim.AnimationId = "rbxassetid://8293847457"
    _G.Character.Animate.idle.Animation1.AnimationId = "rbxassetid://8316301152t"
    _G.Character.Animate.walk.WalkAnim.AnimationId = "rbxassetid://8293847457"
    _G.Character.Animate.idle.Animation2.AnimationId = "rbxassetid://8315839497"
end)
local function slice(hit)
    if mid == false then
        mid = true
         _G.zom = hit.Parent.Name == "zombie"
        _G.zomboss = hit.Parent.Name =="zombieboss"
        if _G.zom then
            _G.zombie = hit.Parent.Zombie
            wait()
            if _G.zombie.Health > 0 then
                _G.zombie.Health -= 50
                local tag = Instance.new("ObjectValue")
                tag.Value = _G.Player
                tag.Name = "creator"
                tag.Parent = _G.zombie
                game:GetService("Debris"):AddItem(tag,5)
            end
        end 
        wait(0.4)
        mid = false
    end
end

thanks in advance.