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