Boolean is not being set to false on server

[master675457]

I’m attempting to set up a sprint system, but when I modify the value on my client, my isSprinting variable doesn’t update on the server. When I try to print it, it always outputs True even when i stop sprinting.

Module Client

local Sprint = {}

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local playerSprint = ReplicatedStorage:WaitForChild("PlayerSprint")

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")

local runSpeed = 30
local walkSpeed = 16

local camera = game.Workspace.CurrentCamera
local TweenService = game:GetService('TweenService')

local sprintAnimationId = "http://www.roblox.com/asset/?id=17113833834"
local sprintAnimTrack = nil
local sprintAnimationLoaded = false
local sprintManaCostRate = 5  -- Mana cost per 0.5 seconds while sprinting
local isSprinting = false


-- Load sprint animation
local function loadAnimations()
	local sprintAnimation = Instance.new("Animation")
	sprintAnimation.AnimationId = sprintAnimationId
	sprintAnimTrack = humanoid:LoadAnimation(sprintAnimation)
	sprintAnimTrack.Looped = true
	sprintAnimTrack.Priority = Enum.AnimationPriority.Action
	sprintAnimTrack:Stop() -- Ensure animation starts stopped
	sprintAnimationLoaded = true
end

local function shiftToSprint()
	if  isSprinting then
		return
	end
	isSprinting = true
	playerSprint:FireServer(humanoid, isSprinting)
	humanoid.WalkSpeed = runSpeed
	TweenService:Create(camera, TweenInfo.new(0.5), { FieldOfView = 80 }):Play()
	if sprintAnimTrack and sprintAnimationLoaded  then
		sprintAnimTrack:Play() -- Play the sprint animation
	end
end


-- Input handling for sprinting (using Left Control)
game:GetService("UserInputService").InputBegan:Connect(function(inputObject, IS)
	if IS then
		return
	end

	if inputObject.KeyCode == Enum.KeyCode.LeftControl then
		shiftToSprint()
	end
end)

game:GetService("UserInputService").InputEnded:Connect(function(inputObject, IS)
	if IS then
		return
	end

	if inputObject.KeyCode == Enum.KeyCode.LeftControl then
		if  isSprinting then
			TweenService:Create(camera, TweenInfo.new(0.5), { FieldOfView = 70 }):Play()
			 isSprinting = false
			humanoid.WalkSpeed = walkSpeed
			if sprintAnimTrack then
				sprintAnimTrack:Stop() -- Stop the sprint animation
			end
		end
	end
end)

-- Initial animation loading
loadAnimations()


return Sprint

Server

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local PlayerSprintEvent = ReplicatedStorage:WaitForChild("PlayerSprint")

local manaCost = 5
local manaRecovery = 2
local sprintManaCostRate = 5 
local walkSpeed = 16  
local lastSprintTime = 0  


PlayerSprintEvent.OnServerEvent:Connect(function(player, humanoid, isSprinting)
	local manaValue = player:WaitForChild("Values"):WaitForChild("Mana").Value

	if isSprinting then
		if manaValue >= sprintManaCostRate then
			print(isSprinting)
			while isSprinting and manaValue >= sprintManaCostRate do
				manaValue = manaValue - sprintManaCostRate
				print("Mana:", manaValue)
				player.Values.Mana.Value = manaValue
				wait(0.5) -- Adjust delay as needed
			end
		end
	else
		print(isSprinting)
	end
end)

[Mr_Spokes]

This would be because even if you change something on the client, it won’t affect the server. To fix this you could use remoteEvents to send a message to the server whenever the player starts or stops sprinting

[master675457]

i am using a remote event so how would i do that

[Mr_Spokes]

Basically you would want to have something like this
Client:

local remoteEvent = game.ReplicatedStorage.RemoteEvent

-- do this whenever you want to toggle the sprint variable on the server
remoteEvent:FireServer()

Server:

local remoteEvent = game.ReplicatedStorage.RemoteEvent
local sprintVar = false

remoteEvent.OnServerEvent:Connect(function()
	sprintVar = not sprintVar
end)

Make sure the remote event is in ReplicatedStorage so it can be accessed by both the server and the client.