attempt to index field 'Character' (a nil value)?

My drink script gives me the error on the title when I use it out of Roblox Studio. Please help me fix it. Here is the script: It says the error is on line 3

local Plr = game.Players.LocalPlayer

local Humanoid = Plr.Character:WaitForChild("Humanoid")

local Tool = script.Parent;


enabled = true




function onActivated()
	if not enabled  then
		return
	end

	enabled = false
	Tool.GripForward = Vector3.new(-0, -0.836, -0.549)
	Tool.GripPos = Vector3.new(1.4, -0.4, 0.3)
	Tool.GripRight = Vector3.new(0.996, -0.0509, 0.0776)
	Tool.GripUp = Vector3.new(0.0928, 0.547, -0.832)


	Tool.Handle.DrinkSound:Play()
	Humanoid.WalkSpeed = Humanoid.WalkSpeed +.5
	game.Players.LocalPlayer.leaderstats.Speed.Value = game.Players.LocalPlayer.leaderstats.Speed.Value +3

	wait(3)
	
	local h = Tool.Parent:FindFirstChild("Humanoid")
	if (h ~= nil) then
		if (Tool.Parent:FindFirstChild("SpeedEffect") == nil) then
			local s = script.Parent.SpeedEffect:Clone()
			s.Disabled = false
			s.Parent = Tool.Parent			
		end
	end


	Tool.GripForward = Vector3.new(-.976,0,-0.217)
	Tool.GripPos = Vector3.new(0.2,-.1,0)
	Tool.GripRight = Vector3.new(.217,0,-.976)
	Tool.GripUp = Vector3.new(0,1,0)


	wait(1)
	enabled = true

end



script.Parent.Activated:connect(onActivated)

For some reason, the Character property bugs many scripts.

Instead of...

local Humanoid = Plr.Character:WaitForChild("Humanoid")

Try...

local chr = Plr.Character
if chr == nil then
  repeat
   -- do nothing.
  until chr ~= nil or chr == true
  -- This repeat loop will keep running until the character is valid. It will then continue the script.

end
local Humanoid = Plr.Character:FindFirstChild("Humanoid") -- The Humanoid is packed with the Character model already.

I haven't tested it. It's Midnight here in the Philippines so chances are it might fail.

Hoped I helped if it worked otherwise.