Program: 93801
Project: 93801
Buggy source:
@Override public void execute(CommandSender sender,CommandArgs args){
  if (!Utils.isPlayer(sender,true))   return;
  if (Utils.isPlayer(sender,false) && ACPlayer.getPlayer(((Player)sender).getName()).hasPower(Type.MUTED) && ACHelper.getInstance().getConfBoolean("String_Node_Str")) {
    Utils.sI18n(sender,"String_Node_Str");
    return;
  }
  Player pSender=(Player)sender;
  Player buddy=ACHelper.getInstance().getReplyPlayer(pSender);
  if (buddy != null) {
    if (!buddy.isOnline()) {
      Utils.sI18n(sender,"String_Node_Str");
      ACHelper.getInstance().removeReplyPlayer(pSender);
      return;
    }
    if (InvisibleWorker.getInstance().hasInvisiblePowers(buddy.getName()) && !PermissionManager.hasPerm(sender,"String_Node_Str",false)) {
      Utils.sI18n(sender,"String_Node_Str","String_Node_Str",args.getString(0));
      return;
    }
    String senderPm="String_Node_Str";
    String msgPrefix="String_Node_Str" + ChatColor.RED + "String_Node_Str"+ ChatColor.WHITE+ "String_Node_Str";
    String msg="String_Node_Str";
    String senderName="String_Node_Str";
    senderName=pSender.getName();
    senderPm=Utils.getPlayerName(pSender,buddy) + ChatColor.WHITE + "String_Node_Str";
    for (    String arg : args)     msg+=arg + "String_Node_Str";
    msg=msg.trim();
    String parsed=Utils.colorParser(msg);
    if (parsed == null)     parsed=msg;
    buddy.sendMessage(msgPrefix + senderPm + parsed);
    ACHelper.getInstance().setReplyPlayer(buddy,pSender);
    if (AFKWorker.getInstance().isAfk(buddy)) {
      AFKWorker.getInstance().sendAfkMessage((Player)sender,buddy);
    }
 else     sender.sendMessage(msgPrefix + senderPm + parsed);
    String spyMsg="String_Node_Str" + ChatColor.GREEN + "String_Node_Str"+ ChatColor.WHITE+ "String_Node_Str"+ senderName+ "String_Node_Str"+ buddy.getName()+ "String_Node_Str"+ parsed;
    for (    ACPlayer p : ACPlayer.getPlayers(Type.SPYMSG))     if (p != null && !p.getName().equals(senderName) && !p.getName().equals(buddy.getName()) && p.getHandler() != null)     p.getHandler().sendMessage(spyMsg);
    if (ACHelper.getInstance().getConfBoolean("String_Node_Str"))     ACLogger.info(spyMsg);
  }
 else   Utils.sI18n(sender,"String_Node_Str");
}

Fixed version (ground truth):
@Override public void execute(CommandSender sender,CommandArgs args){
  if (!Utils.isPlayer(sender,true))   return;
  if (Utils.isPlayer(sender,false) && ACPlayer.getPlayer(((Player)sender)).hasPower(Type.MUTED) && ACHelper.getInstance().getConfBoolean("String_Node_Str")) {
    Utils.sI18n(sender,"String_Node_Str");
    return;
  }
  Player pSender=(Player)sender;
  Player buddy=ACHelper.getInstance().getReplyPlayer(pSender);
  if (buddy != null) {
    if (!buddy.isOnline()) {
      Utils.sI18n(sender,"String_Node_Str");
      ACHelper.getInstance().removeReplyPlayer(pSender);
      return;
    }
    if (InvisibleWorker.getInstance().hasInvisiblePowers(buddy.getName()) && !PermissionManager.hasPerm(sender,"String_Node_Str",false)) {
      Utils.sI18n(sender,"String_Node_Str","String_Node_Str",args.getString(0));
      return;
    }
    String senderPm="String_Node_Str";
    String msgPrefix=Utils.I18n("String_Node_Str");
    String msg="String_Node_Str";
    String senderName="String_Node_Str";
    senderName=pSender.getName();
    senderPm=Utils.getPlayerName(pSender,buddy) + ChatColor.WHITE + "String_Node_Str";
    for (    String arg : args)     msg+=arg + "String_Node_Str";
    msg=msg.trim();
    String parsed=Utils.colorParser(msg);
    if (parsed == null)     parsed=msg;
    buddy.sendMessage(msgPrefix + senderPm + parsed);
    ACHelper.getInstance().setReplyPlayer(buddy,pSender);
    if (AFKWorker.getInstance().isAfk(buddy)) {
      AFKWorker.getInstance().sendAfkMessage((Player)sender,buddy);
    }
 else     sender.sendMessage(msgPrefix + senderPm + parsed);
    String spyMsg="String_Node_Str" + ChatColor.GREEN + "String_Node_Str"+ ChatColor.WHITE+ "String_Node_Str"+ senderName+ "String_Node_Str"+ buddy.getName()+ "String_Node_Str"+ parsed;
    for (    Player p : ACHelper.getInstance().getSpyPlayers())     if (p != null && !p.getName().equals(senderName) && !p.getName().equals(buddy.getName()))     p.sendMessage(spyMsg);
    if (ACHelper.getInstance().getConfBoolean("String_Node_Str"))     ACLogger.info(spyMsg);
  }
 else   Utils.sI18n(sender,"String_Node_Str");
}