How do I stop a script when I equip a tool?

So I have made a string of code that tells my char to stop a script when I equip a tool then turn the script on when I unequip the tool. Here's my code

local Tool = script.Parent.Parent

function onEquippedLocal()
	script.Parent.Parent.Parent:FindFirstChild("Sprint").Disabled = true
end
function onUnequippedLocal()
	script.Parent.Parent.Parent:FindFirstChild("Sprint").Disabled = false
end

Tool.Equipped:connect(onEquippedLocal)
Tool.Unequipped:connect(onUnequippedLocal)

It displays this in the output when I unequip the tool

 20:24:07.228 - Players.Zendex32.Backpack.Tool.Main.LocalScript:7: attempt to index a nil value
20:24:07.229 - Stack Begin
20:24:07.229 - Script 'Players.Zendex32.Backpack.Tool.Main.LocalScript', Line 7
20:24:07.230 - Stack End

The bit for disabling the script works, but when you unequip the tool it doesn't turn the script back on. If someone can fix the script for me that would really help!!!!

Edit: I forgot to say this before but I have tried everything, making a local variable or ANY type of variable BUT NOTHING WORKS!!!!

DOUBLE EDIT: I FIXED IT BY MAKING A VARIABLE HERES THE FIXED SCRIPT

local Tool = script.Parent.Parent
local Plr = script.Parent.Parent.Parent

function onEquippedLocal()
	Plr:FindFirstChild("Sprint").Disabled = true
end
function onUnequippedLocal()
	Plr:FindFirstChild("Sprint").Disabled = false
end

Tool.Equipped:connect(onEquippedLocal)
Tool.Unequipped:connect(onUnequippedLocal)

Feel free to take the script what I did for the tool is put the LocalScript in ANOTHER LocalScript so the Tool isn't so cluttered.

Here is a neat fact about scripts. I saw you used a sprint script so you can sprint when holding the tool.

In order to make the character sprint, you need a SCRIPT. I am assuming you used a LOCALSCRIPT for the tool.

Instead of disabling a script using a local script, just use this NORMAL SCRIPT DIRECTLY in the tool.

script.Parent.Equipped:Connect(function()
	local Player = script.Parent.Parent:FindFirstChild("Humanoid")
	if Player.Health then
		Player.WalkSpeed = 32
	end
end
script.Parent.Unequipped:Connect(function()
	wait(0.1)
	local Player = script.Parent.Parent.Character:FindFirstChild("Humanoid")
	if Player.Health then
		Player.WalkSpeed = 16
	end
end

This should do what I assumed you wanted to do.

If you have any questions or errors, comment below!

-TheLastHabanero