Program: 34002
Project: 34002
Buggy source:
public boolean onCommand(final CommandSender sender,final Command command,final String label,final String[] cmd){
  if (!(sender instanceof Player)) {
    return false;
  }
  final Player player=(Player)sender;
  if (!VaultHelper.checkPerm(player,Settings.PERMPREFIX + "String_Node_Str")) {
    player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorNoPermission);
    return true;
  }
  if (plugin.getGrid().getIsland(player.getUniqueId()) == null) {
    player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorNoIsland);
    return true;
  }
switch (cmd.length) {
case 0:
    player.openInventory(challengePanel(player));
  return true;
case 1:
if (cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str")) {
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengeshelp1);
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengeshelp2);
}
 else if (isLevelAvailable(player,getChallengeConfig().getString("String_Node_Str" + cmd[0].toLowerCase() + "String_Node_Str"))) {
  final String challenge=cmd[0].toLowerCase();
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesname + "String_Node_Str"+ ChatColor.WHITE+ challenge);
  sender.sendMessage(ChatColor.WHITE + plugin.myLocale(player.getUniqueId()).challengeslevel + "String_Node_Str"+ ChatColor.GOLD+ getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str"));
  sender.sendMessage(ChatColor.GOLD + getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str").replace("String_Node_Str",Settings.ISLANDCOMMAND));
  final String type=getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str").toLowerCase();
  if (type.equals("String_Node_Str")) {
    if (getChallengeConfig().getBoolean("String_Node_Str" + cmd[0].toLowerCase() + "String_Node_Str")) {
      sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesitemTakeWarning);
    }
  }
 else   if (type.equals("String_Node_Str")) {
    sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengeserrorItemsNotThere);
  }
  if (plugin.getPlayers().checkChallenge(player.getUniqueId(),challenge) && (!type.equals("String_Node_Str") || !getChallengeConfig().getBoolean("String_Node_Str" + challenge + "String_Node_Str",false))) {
    sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesnotRepeatable);
    return true;
  }
  double moneyReward=0;
  int expReward=0;
  String rewardText="String_Node_Str";
  if (!plugin.getPlayers().checkChallenge(player.getUniqueId(),challenge)) {
    moneyReward=getChallengeConfig().getDouble("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str",0D);
    rewardText=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str","String_Node_Str"));
    expReward=getChallengeConfig().getInt("String_Node_Str" + challenge + "String_Node_Str",0);
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesfirstTimeRewards);
  }
 else {
    moneyReward=getChallengeConfig().getDouble("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str",0D);
    rewardText=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str","String_Node_Str"));
    expReward=getChallengeConfig().getInt("String_Node_Str" + challenge + "String_Node_Str",0);
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesrepeatRewards);
  }
  sender.sendMessage(ChatColor.WHITE + rewardText);
  if (expReward > 0) {
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesexpReward + "String_Node_Str"+ ChatColor.WHITE+ expReward);
  }
  if (Settings.useEconomy && moneyReward > 0) {
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesmoneyReward + "String_Node_Str"+ ChatColor.WHITE+ VaultHelper.econ.format(moneyReward));
  }
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengestoCompleteUse + ChatColor.WHITE+ "String_Node_Str"+ label+ "String_Node_Str"+ challenge);
}
 else {
  sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesinvalidChallengeName);
}
return true;
case 2:
if (cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str")) {
if (!player.getWorld().equals(ASkyBlock.getIslandWorld())) {
if (!Settings.createNether || !Settings.newNether || !player.getWorld().equals(ASkyBlock.getNetherWorld())) {
  player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorWrongWorld);
  return true;
}
}
if (checkIfCanCompleteChallenge(player,cmd[1].toLowerCase())) {
int oldLevel=getLevelDone(player);
giveReward(player,cmd[1].toLowerCase());
int newLevel=getLevelDone(player);
if (oldLevel < newLevel) {
  plugin.getChatListener().setPlayerChallengeLevel(player);
  String level=Settings.challengeLevels.get(newLevel);
  if (!level.isEmpty()) {
    String message=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str"));
    if (!message.isEmpty()) {
      player.sendMessage(ChatColor.GREEN + message);
    }
    String[] itemReward=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str").split("String_Node_Str");
    String rewardDesc=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str");
    if (!rewardDesc.isEmpty()) {
      player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesrewards + "String_Node_Str"+ ChatColor.WHITE+ rewardDesc);
    }
    List<ItemStack> rewardedItems=giveItems(player,itemReward);
    double moneyReward=getChallengeConfig().getDouble("String_Node_Str" + level + "String_Node_Str",0D);
    int expReward=getChallengeConfig().getInt("String_Node_Str" + level + "String_Node_Str",0);
    if (expReward > 0) {
      player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesexpReward + "String_Node_Str"+ ChatColor.WHITE+ expReward);
      player.giveExp(expReward);
    }
    if (Settings.useEconomy && moneyReward > 0 && (VaultHelper.econ != null)) {
      EconomyResponse e=VaultHelper.econ.depositPlayer(player,Settings.worldName,moneyReward);
      if (e.transactionSuccess()) {
        player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesmoneyReward + "String_Node_Str"+ ChatColor.WHITE+ VaultHelper.econ.format(moneyReward));
      }
 else {
        plugin.getLogger().severe("String_Node_Str" + player.getUniqueId() + "String_Node_Str"+ e.errorMessage);
        plugin.getLogger().severe("String_Node_Str" + moneyReward);
      }
    }
    String[] permList=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str").split("String_Node_Str");
    for (    final String s : permList) {
      if (!s.isEmpty()) {
        VaultHelper.addPerm(player,s);
        plugin.getLogger().info("String_Node_Str" + s + "String_Node_Str"+ player.getName()+ "String_Node_Str");
      }
    }
    List<String> commands=getChallengeConfig().getStringList("String_Node_Str" + level + "String_Node_Str");
    runCommands(player,commands);
    ChallengeLevelCompleteEvent event=new ChallengeLevelCompleteEvent(player,oldLevel,newLevel,rewardedItems);
    plugin.getServer().getPluginManager().callEvent(event);
  }
}
}
return true;
}
default :
return false;
}
}

Fixed version (ground truth):
public boolean onCommand(final CommandSender sender,final Command command,final String label,final String[] cmd){
  if (!(sender instanceof Player)) {
    return false;
  }
  final Player player=(Player)sender;
  if (!VaultHelper.checkPerm(player,Settings.PERMPREFIX + "String_Node_Str")) {
    player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorNoPermission);
    return true;
  }
  if (plugin.getGrid().getIsland(player.getUniqueId()) == null) {
    player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorNoIsland);
    return true;
  }
switch (cmd.length) {
case 0:
    player.openInventory(challengePanel(player));
  return true;
case 1:
if (cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str")) {
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengeshelp1);
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengeshelp2);
}
 else if (isLevelAvailable(player,getChallengeConfig().getString("String_Node_Str" + cmd[0].toLowerCase() + "String_Node_Str"))) {
  final String challenge=cmd[0].toLowerCase();
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesname + "String_Node_Str"+ ChatColor.WHITE+ challenge);
  sender.sendMessage(ChatColor.WHITE + plugin.myLocale(player.getUniqueId()).challengeslevel + "String_Node_Str"+ ChatColor.GOLD+ getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str"));
  sender.sendMessage(ChatColor.GOLD + getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str").replace("String_Node_Str",Settings.ISLANDCOMMAND));
  final String type=getChallengeConfig().getString("String_Node_Str" + challenge + "String_Node_Str","String_Node_Str").toLowerCase();
  if (type.equals("String_Node_Str")) {
    if (getChallengeConfig().getBoolean("String_Node_Str" + cmd[0].toLowerCase() + "String_Node_Str")) {
      sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesitemTakeWarning);
    }
  }
 else   if (type.equals("String_Node_Str")) {
    sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengeserrorItemsNotThere);
  }
  if (plugin.getPlayers().checkChallenge(player.getUniqueId(),challenge) && (!type.equals("String_Node_Str") || !getChallengeConfig().getBoolean("String_Node_Str" + challenge + "String_Node_Str",false))) {
    sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesnotRepeatable);
    return true;
  }
  double moneyReward=0;
  int expReward=0;
  String rewardText="String_Node_Str";
  if (!plugin.getPlayers().checkChallenge(player.getUniqueId(),challenge)) {
    moneyReward=getChallengeConfig().getDouble("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str",0D);
    rewardText=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str","String_Node_Str"));
    expReward=getChallengeConfig().getInt("String_Node_Str" + challenge + "String_Node_Str",0);
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesfirstTimeRewards);
  }
 else {
    moneyReward=getChallengeConfig().getDouble("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str",0D);
    rewardText=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + challenge.toLowerCase() + "String_Node_Str","String_Node_Str"));
    expReward=getChallengeConfig().getInt("String_Node_Str" + challenge + "String_Node_Str",0);
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesrepeatRewards);
  }
  sender.sendMessage(ChatColor.WHITE + rewardText);
  if (expReward > 0) {
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesexpReward + "String_Node_Str"+ ChatColor.WHITE+ expReward);
  }
  if (Settings.useEconomy && moneyReward > 0) {
    sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesmoneyReward + "String_Node_Str"+ ChatColor.WHITE+ VaultHelper.econ.format(moneyReward));
  }
  sender.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengestoCompleteUse + ChatColor.WHITE+ "String_Node_Str"+ label+ "String_Node_Str"+ challenge);
}
 else {
  sender.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).challengesinvalidChallengeName);
}
return true;
case 2:
if (cmd[0].equalsIgnoreCase("String_Node_Str") || cmd[0].equalsIgnoreCase("String_Node_Str")) {
if (!player.getWorld().equals(ASkyBlock.getIslandWorld())) {
if (!Settings.createNether || !Settings.newNether || ASkyBlock.getNetherWorld() == null || !player.getWorld().equals(ASkyBlock.getNetherWorld())) {
  player.sendMessage(ChatColor.RED + plugin.myLocale(player.getUniqueId()).errorWrongWorld);
  return true;
}
}
if (checkIfCanCompleteChallenge(player,cmd[1].toLowerCase())) {
int oldLevel=getLevelDone(player);
giveReward(player,cmd[1].toLowerCase());
int newLevel=getLevelDone(player);
if (oldLevel < newLevel) {
  plugin.getChatListener().setPlayerChallengeLevel(player);
  String level=Settings.challengeLevels.get(newLevel);
  if (!level.isEmpty()) {
    String message=ChatColor.translateAlternateColorCodes('&',getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str"));
    if (!message.isEmpty()) {
      player.sendMessage(ChatColor.GREEN + message);
    }
    String[] itemReward=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str").split("String_Node_Str");
    String rewardDesc=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str");
    if (!rewardDesc.isEmpty()) {
      player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesrewards + "String_Node_Str"+ ChatColor.WHITE+ rewardDesc);
    }
    List<ItemStack> rewardedItems=giveItems(player,itemReward);
    double moneyReward=getChallengeConfig().getDouble("String_Node_Str" + level + "String_Node_Str",0D);
    int expReward=getChallengeConfig().getInt("String_Node_Str" + level + "String_Node_Str",0);
    if (expReward > 0) {
      player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesexpReward + "String_Node_Str"+ ChatColor.WHITE+ expReward);
      player.giveExp(expReward);
    }
    if (Settings.useEconomy && moneyReward > 0 && (VaultHelper.econ != null)) {
      EconomyResponse e=VaultHelper.econ.depositPlayer(player,Settings.worldName,moneyReward);
      if (e.transactionSuccess()) {
        player.sendMessage(ChatColor.GOLD + plugin.myLocale(player.getUniqueId()).challengesmoneyReward + "String_Node_Str"+ ChatColor.WHITE+ VaultHelper.econ.format(moneyReward));
      }
 else {
        plugin.getLogger().severe("String_Node_Str" + player.getUniqueId() + "String_Node_Str"+ e.errorMessage);
        plugin.getLogger().severe("String_Node_Str" + moneyReward);
      }
    }
    String[] permList=getChallengeConfig().getString("String_Node_Str" + level + "String_Node_Str","String_Node_Str").split("String_Node_Str");
    for (    final String s : permList) {
      if (!s.isEmpty()) {
        VaultHelper.addPerm(player,s);
        plugin.getLogger().info("String_Node_Str" + s + "String_Node_Str"+ player.getName()+ "String_Node_Str");
      }
    }
    List<String> commands=getChallengeConfig().getStringList("String_Node_Str" + level + "String_Node_Str");
    runCommands(player,commands);
    ChallengeLevelCompleteEvent event=new ChallengeLevelCompleteEvent(player,oldLevel,newLevel,rewardedItems);
    plugin.getServer().getPluginManager().callEvent(event);
  }
}
}
return true;
}
default :
return false;
}
}