How do i find a localplayer without a nil value? [closed]

1. Not LocalScript
2. why its a nil value?
3. I never using a "game.player.localplayer"

local updateInterval = .4
local currentColor = 1
local colors = {26, 21}
local Tool = script.Parent 
local damage = 1

local ticksound = Instance.new("Sound")
ticksound.SoundId = "rbxasset://sounds\\clickfast.wav"
ticksound.Parent = script.Parent

function update()
    updateInterval = updateInterval * .9
    script.Parent.BrickColor = BrickColor.new(colors[currentColor])
    currentColor = currentColor + 1
    if (currentColor > 2) then currentColor = 1 end
end


function blowUp()
    local sound = Instance.new("Sound")
        sound.SoundId = "rbxasset://sounds\\Rocket shot.wav"
        sound.Parent = script.Parent
        sound.Volume = 1
        sound:play()
    local explosion = Instance.new("Explosion")
    explosion.BlastRadius = 12
    explosion.BlastPressure = 0 -- these are really wussy units

    -- find instigator tag
    local creator = script.Parent:findFirstChild("creator")
    if creator ~= nil then
        explosion.Hit:connect(function(part, distance)  onPlayerBlownUp(part, distance, creator) end)
    end

    explosion.Position = script.Parent.Position
    explosion.Parent = game.Workspace
    script.Parent.Transparency = 1
end

function onPlayerBlownUp(part, distance, creator)
    if part.Name == "Head" then
        local humanoid = part.Parent.Human
        local vCharacter=Tool.Parent
        local vPlayer=game.Players:playerFromCharacter(vCharacter)
        local MinDamageValue = (vPlayer.Data.Stats.Power.Value/2+vPlayer.Data.Boost.BoostPower.Value/2+vPlayer.Armor.Power.Value/2)
        local MaxDamageValue = (damage+vPlayer.Data.Stats.Power.Value*4+vPlayer.Data.Boost.BoostPower.Value*4+vPlayer.Armor.Power.Value*4)
        local Damage = math.random(MinDamageValue,MaxDamageValue*(255-humanoid.Parent.EnemySettings.Defend.Value-1)/256)+1
        humanoid.Health = humanoid.Health - Damage
        tagHumanoid(humanoid, creator)
    end
end

function tagHumanoid(humanoid, creator)
    -- tag does not need to expire iff all explosions lethal    
    if creator ~= nil then
        local new_tag = creator:clone()
        new_tag.Parent = humanoid
    end
end

function untagHumanoid(humanoid)
    if humanoid ~= nil then
        local tag = humanoid:findFirstChild("creator")
        if tag ~= nil then
            tag.Parent = nil
        end
    end
end

while updateInterval > .1 do
    wait(updateInterval)
    update()    
    ticksound:play()    
end

blowUp()
wait(2)
script.Parent:remove()