This script crashes my games servers. Anybody know why?

I made a script that teleports players to a private server. Once the Countdown reaches 0, it will teleport a table of the players to the server. When this happens, sometimes the server will crash. Anybody know why? Here's the script

local ts = game:GetService("TeleportService")
local summerevent = game.ReplicatedStorage.SummerEvent
local countdown = false

summerevent.JoinGame.OnServerEvent:Connect(function(plr, playerslot)
    playerslot.Value = plr.Name
end)

summerevent.LeaveGame.OnServerEvent:Connect(function(plr, playerslot)
    playerslot.Value = "None"
end)


while true do --main part
    wait(1)
    if summerevent.Countdown.Value ~= 0 then
        summerevent.Countdown.Value = summerevent.Countdown.Value - 1
    else
        summerevent.Countdown.Value = 25
        local code = ts:ReserveServer(5608381405)

        local players =                 {game.Players:FindFirstChild(summerevent.Players.Player1.Value),game.Players:FindFirstChild(summerevent.Players.Player2.Value),game.Players:FindFirstChild(summerevent.Players.Player3.Value),game.Players:FindFirstChild(summerevent.Players.Player4.Value)}

        ts:TeleportToPrivateServer(5608381405,code,players)

        for i,v in pairs(summerevent.Players:GetChildren()) do
            v.Value = "None"
        end

    end 
end