How to make a animation stop when a player moves and restart when he stops moving?

local player = game.Players.LocalPlayer
repeat wait() until player.Character
local char = player.Character
local hum = char.Humanoid
local running = false
local UIS = game:GetService("UserInputService")
local ToggleSusanoo = game.ReplicatedStorage:WaitForChild("ToggleSusanoo")

UIS.InputBegan:Connect(function(Input, Chat)
    if Input.KeyCode == Enum.KeyCode.E and not Chat and hum.Health >= 1 then
        if running == false then
            ToggleSusanoo:FireServer(true)
            local Anim = Instance.new('Animation')
            Anim.AnimationId = script.Idle.AnimationId
            PlayAnim = char.Humanoid:LoadAnimation(Anim)
            PlayAnim:Play()

            running = true
        elseif running == true then
            ToggleSusanoo:FireServer(false)
            PlayAnim:Stop()
            running = false
        elseif running == true then

            if hum.walkspeed > 0 then

                PlayAnim:Stop() 
        end




        end
    end
end)

this is the script and i tried to make it so when the walspeed is bigger than 0 the animation stops but it didnt work