I have been having problems with a custom health bar, any idea on why?

I have been having trouble with making a custom health bar. What will happen is that it works when you are losing health and die, but it will immediately stop working after you respawn into the game.

local player = game.Players.LocalPlayer
local char = player.Character
local hum = char:WaitForChild("Humanoid")
local TweenService = game:GetService("TweenService")

hum.Changed:connect(function(health)
	if health == "Health" or health == "MaxHealth" then
	    local bar = script.Parent
	    local info = TweenInfo.new(0.15, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut)
	    local goal = {["Size"] = UDim2.new((hum.Health/hum.MaxHealth), 0, 1, 0)}
	
	    TweenService:Create(bar, info, goal):Play()
	    script.Parent.Parent.TextLabel.Text = ("Health: " .. math.floor(hum.Health).."/".. math.floor(hum.MaxHealth))
	end
end)

Any help is appreciated.

add this at the top and it should work

local char = player.Character
if not char or not char.Parent then
	char = player.CharacterAdded:wait()
end