Trying to make a script where head color changes when jumping [ERROR]?

repeat wait() until game.Players.LocalPlayer.Character

local UIS = game:GetService("UserInputService")
local jumped = false
local player = game.Players.LocalPlayer
local char = player.Character

UIS.InputBegan:connect(function(input)
    if input.Keycode == Enum.KeyCode.Space and not jumped then
        jumped = true
        local ogColor = char:FindFirstChild("Head").BrickColor
        char:FindFirstChild("Head").BrickColor = BrickColor.new("Bright blue")
        wait(0.5)
        char:FindFirstChild("Head").BrickColor = BrickColor.new(ogColor)
        jumped = false
    end
end)

As well as not being sure if this script works, I also get a "attempt to index nil with 'Character'" error in console.

I also would rather have the color change back to the original Player's head color after the jumping animation ends (rather than 0.5 seconds) but am not sure how to implement that.

Hello, In your script you wrote "char = player.Character" which is not a thing, at least not anymore. The player which is in game.Players is basically the client. If you want to get the actual head it would be in the workspace, the player's physical character, which is the head, torso, shirt, hat, etc.

repeat wait() until game.Workspace:FindFirstChild(game.Players.LocalPlayer.Name) -- this would work

local UIS = game:GetService("UserInputService")
local jumped = false
local player = game.Players.LocalPlayer
local char = game.Workspace[player.Name] -- This would work as it finds the model inside workspace by getting the players name

UIS.InputBegan:connect(function(input)
    if input.KeyCode == Enum.KeyCode.Space and not jumped then -- KeyCode must be capital
        jumped = true
        local ogColor = char:FindFirstChild("Head").BrickColor
        char:FindFirstChild("Head").BrickColor = BrickColor.new("Bright blue")
        wait(0.5)
        char:FindFirstChild("Head").BrickColor = BrickColor.new(ogColor)
        jumped = false
    end
end)