Task

public class GameTimeBeforePvP
{
    int task;

    public GameTimeBeforePvP()
    {
        GameStates.setState(GameStates.PVP);
        task = Bukkit.getScheduler().scheduleSyncRepeatingTask(Main.getInstance(), new Runnable()
        {

            public void run()
            {
                Main.getInstance().getBoard().decrementCountdown();
                Main.getInstance().getBoard().updateScoreboard();

                if(Main.getInstance().getBoard().getCountdown() == 0)
                {
                    Bukkit.getScheduler().cancelTask(task);
                    new GameTimeBeforeAssaut(); // The same class except the name and some messages I spared you, with same bug of course
                }
            }

        }, 20, 20);
    }
}