Roblox How To | Creating a Simple Shift to Sprint Script!

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#21

Any Errors in the Output That you can Find?

Guide To Making a Good Roblox Game
#22

This should be player.Character or player.CharacterAdded:Wait()!

I personally find using one script for a sprint script better, I use a module just to wrap simple key down/up actions with UserInputService, and this ends up being my code:

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local KeyInputService = require(ReplicatedStorage.Utils.KeyInputService)

local LocalPlayer = Players.LocalPlayer
local PlayerCharacter = LocalPlayer.Character

LocalPlayer.CharacterAdded:Connect(function(character: Model)
	PlayerCharacter = character
end)

KeyInputService.ConnectToKeyCode(Enum.KeyCode.LeftShift, function(isBegin)
	if PlayerCharacter == nil then
		return
	end

	local humanoid = PlayerCharacter:FindFirstChild("Humanoid")
	if humanoid then
		humanoid.WalkSpeed = isBegin and 22 or 16
	end
end)
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#23

Instead of wait, use task.wait(), its more officiant and useful and its more modern and reliable.