[Help] Simple "AntiBot"

[KevinCOder]

Hello guys, I have a little problem with AntiBot

 Spoiler

if (client.WaitingKillCaptcha)
            {
                if (Now32 > client.KillCountCaptchaStamp.AddSeconds(60))
                {
                    client.Disconnect();
                }
            }
            else
            {
                if (client.Entity.KillCount < 0) client.Entity.KillCount = 0;
                if (client.Entity.KillCount >= 1500 || client.Entity.KillCount2 >= 150)
                {
                    client.KillCountCaptchaStamp = Time32.Now;
                    client.WaitingKillCaptcha = true;

                    Npcs dialog = new Npcs(client);
                    client.ActiveNpc = 9999997;
                    client.KillCountCaptcha = client.GenerateCaptcha(5);
                    dialog.Text("Input the current text: " + client.KillCountCaptcha + " to verify your humanity.");
                    dialog.Input("Captcha message:", 1, (byte)client.KillCountCaptcha.Length);
                    dialog.Option("No thank you.", 255);
                    dialog.Send();
                    return;
                }
                else
                {
                    if (Now32 > client.LastMove.AddMinutes(5) && Now32 < client.LastAttack.AddSeconds(5))
                    {
                        if (client.WaitingKillCaptcha)
                        {
                            if (Now32 > client.KillCountCaptchaStamp.AddSeconds(60))
                            {
                                client.Disconnect();
                            }
                        }
                        else
                        {
                            client.KillCountCaptchaStamp = Time32.Now;
                            client.WaitingKillCaptcha = true;

                            Npcs dialog = new Npcs(client);
                            client.ActiveNpc = 9999997;
                            client.KillCountCaptcha = client.GenerateCaptcha(5);
                            dialog.Text("Input the current text: " + client.KillCountCaptcha + " to verify your humanity.");
                            dialog.Input("Captcha message:", 1, (byte)client.KillCountCaptcha.Length);
                            dialog.Option("No thank you.", 255);
                            dialog.Send();
                        }
                    }
                }
            }

I put the correct captcha, the dialog appears again and then get disconnection

Anyone help me?
THX