Why does this only work in studio?

So trying to make it so after a song it picks a new one if theres no queued song.It only is working in studio and only plays the same song and stops after it in game. Ive taken precautions to help stop it, but nothing is working. what do i do?

local MusicBrick = workspace.MusicPlayer local Queue = game.ServerStorage.SongQueue

local MusicBrick = workspace.MusicPlayer
local Queue = game.ServerStorage.SongQueue

while wait() do
    if Queue.S1.Value == "Blank" then -- No songs in queue
        local songs = MusicBrick:GetChildren()
        while true do
        song = songs[math.random(1, #songs)]
        repeat wait() until song ~= nil
        if song:IsA("Sound") then break end
        end
        song:Play()
        song.Ended:wait()
    elseif Queue.S1.Value ~= "Blank" then -- Song in Queue
        MusicBrick[Queue.S1.Value]:Play()
        local song = MusicBrick[Queue.S1.Value]
        Queue.S1.Value = Queue.S2.Value
        Queue.S2.Value = Queue.S3.Value
        Queue.S4.Value = Queue.S5.Value
        Queue.S5.Value = "Blank"
        song.Ended:wait()
    end
end