(Local Script) Double Jump Testing

local char = owner.Character
local hum = char:FindFirstChildWhichIsA'Humanoid'
local lleg = char:FindFirstChild('Left Leg')
local rleg = char:FindFirstChild('Right Leg')
local player = owner
local mouse = player:GetMouse()
local head = char:FindFirstChild('Head')

local doublejump = true


mouse.KeyDown:Connect(function(key)
    if tonumber( string.byte(key) )==32 and hum.FloorMaterial==Enum.Material.Air and
        hum:GetState()==Enum.HumanoidStateType.Freefall and doublejump==true and
        workspace:FindFirstChild('∞jump',true)==nil then
        local stop = false
        doublejump = false
        local part = Instance.new("Part",char)
        part.Name = '∞jump'
        part.Size = Vector3.new(4,4,4)
        part.CFrame = head.CFrame + Vector3.new(0,-5.7,0)
        part.Anchored = true
        wait()

        if part then
            part.CanCollide = false
            part:Destroy()
        end
        while true do
            wait(.1)
            if hum.FloorMaterial~=Enum.Material.Air then
                doublejump = true
                break
            end
        end

    end
end)