Im trying to make a camera effect when music plays, but this stops my sprint function, why?

I'm making a camera effect where the FOV reacts to the music. I also have shift to sprint function which also changes the FOV, when both are running, the FOV for the sprint function doesn't work. I have tried placing variables to stop them running both at the same time but it still doesn't work. This is my sprint script:

-- Sprinting Function when left shift presed

local function beginSprint(input, gameProcessed)
    if not gameProcessed then
        if input.UserInputType == Enum.UserInputType.Keyboard then
            local keycode = input.KeyCode
            if keycode == Enum.KeyCode.LeftShift then
                player.Character.Humanoid.WalkSpeed = sprintSpeed
                cameraSprintTween:Play()
            end
        end
    end
end

-- Walking Function when left shift released

local function endSprint(input, gameProcessed)
    if not gameProcessed then
        if input.UserInputType == Enum.UserInputType.Keyboard then
            local keycode = input.KeyCode
            if keycode == Enum.KeyCode.LeftShift then
                player.Character.Humanoid.WalkSpeed = walkSpeed
                cameraWalkTween:Play()
            end
        end
    end
end

userInput.InputBegan:Connect(beginSprint)
userInput.InputEnded:Connect(endSprint)

And this is the code for the Music-camera FOV reaction

local musicTweenInfo = TweenInfo.new(
    0.05, -- Length(seconds)
    Enum.EasingStyle.Sine,  -- Easing Style
    Enum.EasingDirection.InOut -- Easing Direction
)

while wait(0.02) do
    local loundess = sound.PlaybackLoudness/200
    if loundess > loundess/2 then
        local cameraProperties = {FieldOfView = 70 + loundess}
        local cameraMusicTween = game:GetService("TweenService"):Create(game.Workspace.CurrentCamera, musicTweenInfo, cameraProperties)
        cameraMusicTween:Play()
    end
end