Shai Hu problem with ignore list

Hello, use plugin like  Main.cs:

using System.ComponentModel;
using wManager.Wow.ObjectManager;

public class Main : wManager.Plugin.IPlugin
{
    public void Initialize()
    {
        wManager.Events.FightEvents.OnFightStart += delegate(WoWUnit unit, CancelEventArgs cancelable) {
            if (unit != null && unit.IsValid && unit.Entry == 12345)
            {
                if (!wManager.Wow.ObjectManager.ObjectManager.BlackListObjectManagerGuid.Contains(unit.Guid))
                    wManager.Wow.ObjectManager.ObjectManager.BlackListObjectManagerGuid.Add(unit.Guid);
                cancelable.Cancel = true;
            }
        };
    }

    public void Dispose()
    {
    }

    public void Settings()
    {
    }
}

Replace 12345 by mob entry id