Why does this only loop in studio?(Unsolved)

It works just fine in studio. but online it only plays the same song once everytime then it stops

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