Program: 51631
Project: 51631
Buggy source:
public boolean createTrader(Player player,String[] args){
  String traderName="String_Node_Str";
  String owner=player.getName();
  String clanTag="String_Node_Str";
  String townName="String_Node_Str";
  String factionName="String_Node_Str";
  EntityType entityType=EntityType.PLAYER;
  EcoNpcType traderType=getDefaultTraderType(player);
  WalletType walletType=getDefaultWalletType(player,traderType);
  for (  String arg : args) {
    if (arg.startsWith("String_Node_Str")) {
      owner=arg.substring(2);
      walletType=WalletType.OWNER;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      clanTag=arg.substring(3);
      walletType=WalletType.SIMPLE_CLANS;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      townName=arg.substring(5);
      walletType=WalletType.TOWNY;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      factionName=arg.substring(2);
      walletType=WalletType.FACTIONS;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      if (!permsManager.has(player,"String_Node_Str" + arg.substring(2))) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
      traderType=EcoNpcType.getTypeByName(arg.substring(2));
      if (traderType == null || traderType.isBanker()) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
    }
 else     if (arg.startsWith("String_Node_Str")) {
      if (!permsManager.has(player,"String_Node_Str" + arg.substring(2))) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
      walletType=WalletType.getTypeByName(arg.substring(2));
    }
 else     if (arg.startsWith("String_Node_Str")) {
      entityType=EntityType.fromName(arg.substring(2));
    }
 else {
      traderName+=arg + "String_Node_Str";
    }
  }
  if (traderName.isEmpty() || args.length == 1 || traderName.equals("String_Node_Str"))   traderName="String_Node_Str";
 else   traderName=traderName.substring(7,traderName.length() - 1);
  if (walletType == null || traderType == null || entityType == null) {
    player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
    return true;
  }
  NPC npc=CitizensAPI.getNPCRegistry().createNPC(entityType,traderName);
  npc.addTrait(TraderCharacterTrait.class);
  npc.addTrait(MobType.class);
  npc.getTrait(MobType.class).setType(entityType);
  npc.spawn(player.getLocation());
  System.out.print("String_Node_Str");
  npc.getTrait(TraderCharacterTrait.class).implementTrader();
  TraderConfigPart settings=npc.getTrait(TraderCharacterTrait.class).getConfig();
  System.out.print("String_Node_Str");
  npc.getTrait(TraderCharacterTrait.class).setType(traderType);
  System.out.print("String_Node_Str");
  settings.getWallet().setType(walletType);
  System.out.print("String_Node_Str");
  if (walletType.equals(WalletType.SIMPLE_CLANS)) {
    Clan clan=CitizensTrader.getSimpleClans().getClanManager().getClan(clanTag);
    if (clan == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setClan(clan);
  }
  if (walletType.equals(WalletType.TOWNY)) {
    Town town=CitizensTrader.getTowny().getTownyUniverse().getTownsMap().get(townName);
    if (town == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setTown(town);
  }
  if (walletType.equals(WalletType.FACTIONS)) {
    Faction faction=Factions.i.getByTag(factionName);
    if (faction == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setFaction(faction);
  }
  settings.setOwner(owner);
  player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str","String_Node_Str").replace("String_Node_Str",player.getName()));
  return true;
}

Fixed version (ground truth):
public boolean createTrader(Player player,String[] args){
  String traderName="String_Node_Str";
  String owner=player.getName();
  String clanTag="String_Node_Str";
  String townName="String_Node_Str";
  String factionName="String_Node_Str";
  EntityType entityType=EntityType.PLAYER;
  EcoNpcType traderType=getDefaultTraderType(player);
  WalletType walletType=getDefaultWalletType(player,traderType);
  for (  String arg : args) {
    if (arg.startsWith("String_Node_Str")) {
      owner=arg.substring(2);
      walletType=WalletType.OWNER;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      clanTag=arg.substring(3);
      walletType=WalletType.SIMPLE_CLANS;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      townName=arg.substring(5);
      walletType=WalletType.TOWNY;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      factionName=arg.substring(2);
      walletType=WalletType.FACTIONS;
    }
 else     if (arg.startsWith("String_Node_Str")) {
      if (!permsManager.has(player,"String_Node_Str" + arg.substring(2))) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
      traderType=EcoNpcType.getTypeByName(arg.substring(2));
      if (traderType == null || traderType.isBanker()) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
    }
 else     if (arg.startsWith("String_Node_Str")) {
      if (!permsManager.has(player,"String_Node_Str" + arg.substring(2))) {
        player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
        return true;
      }
      walletType=WalletType.getTypeByName(arg.substring(2));
    }
 else     if (arg.startsWith("String_Node_Str")) {
      entityType=EntityType.fromName(arg.substring(2));
    }
 else {
      traderName+=arg + "String_Node_Str";
    }
  }
  if (traderName.isEmpty() || args.length == 1 || traderName.equals("String_Node_Str"))   traderName="String_Node_Str";
 else   traderName=traderName.substring(7,traderName.length() - 1);
  if (walletType == null || traderType == null || entityType == null) {
    player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
    return true;
  }
  NPC npc=CitizensAPI.getNPCRegistry().createNPC(entityType,traderName);
  npc.addTrait(TraderCharacterTrait.class);
  npc.addTrait(MobType.class);
  npc.getTrait(MobType.class).setType(entityType);
  npc.spawn(player.getLocation());
  npc.getTrait(TraderCharacterTrait.class).implementTrader();
  TraderConfigPart settings=npc.getTrait(TraderCharacterTrait.class).getConfig();
  npc.getTrait(TraderCharacterTrait.class).setType(traderType);
  settings.getWallet().setType(walletType);
  if (walletType.equals(WalletType.SIMPLE_CLANS)) {
    Clan clan=CitizensTrader.getSimpleClans().getClanManager().getClan(clanTag);
    if (clan == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setClan(clan);
  }
  if (walletType.equals(WalletType.TOWNY)) {
    Town town=CitizensTrader.getTowny().getTownyUniverse().getTownsMap().get(townName);
    if (town == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setTown(town);
  }
  if (walletType.equals(WalletType.FACTIONS)) {
    Faction faction=Factions.i.getByTag(factionName);
    if (faction == null) {
      player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str"));
      return true;
    }
    settings.getWallet().setFaction(faction);
  }
  settings.setOwner(owner);
  player.sendMessage(locale.getLocaleString("String_Node_Str","String_Node_Str","String_Node_Str").replace("String_Node_Str",player.getName()));
  return true;
}