Program: 41939
Project: 41939
Buggy source:
public boolean execute(ICommandSender sender,String[] args){
  if (args.length < 2 && args.length >= 3) {
    sender.sendMessage(getUsage());
    return true;
  }
  if ("String_Node_Str".equals(args[1]) && plugin.getConfig().getBoolean("String_Node_Str")) {
    sender.sendMessage(C("String_Node_Str"));
    return true;
  }
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.ADMIN_ADD) || player.hasPermission(PermissionNames.USER_ADD)) {
    IWorld world=player.getWorld();
    if (manager.isPlotWorld(player)) {
      PlotMapInfo pmi=manager.getMap(world);
      Plot plot=manager.getPlot(player);
      if (plot != null) {
        String allowed;
        if ("String_Node_Str".equals(args[1])) {
          allowed="String_Node_Str";
        }
 else {
          if (serverBridge.getPlayer(args[1]) != null) {
            allowed=serverBridge.getPlayer(args[1]).getUniqueId().toString();
          }
 else {
            player.sendMessage(String.format("String_Node_Str",args[1]));
            return true;
          }
        }
        if (player.getUniqueId().equals(plot.getOwnerId()) || player.hasPermission(PermissionNames.ADMIN_ADD)) {
          if (plot.isMember(allowed).isPresent()) {
            player.sendMessage(C("String_Node_Str",args[1]));
          }
 else {
            PlotAddTrustedEvent event=new PlotAddTrustedEvent(plot,player,allowed);
            plugin.getEventBus().post(event);
            double price=0.0;
            if (manager.isEconomyEnabled(pmi)) {
              price=pmi.getAddPlayerPrice();
              if (serverBridge.has(player,pmi.getAddPlayerPrice())) {
                player.sendMessage("String_Node_Str" + serverBridge.getEconomy().get().format(price) + "String_Node_Str"+ "String_Node_Str");
                return true;
              }
 else               if (!event.isCancelled()) {
                EconomyResponse er=serverBridge.withdrawPlayer(player,price);
                if (!er.transactionSuccess()) {
                  player.sendMessage(er.errorMessage);
                  serverBridge.getLogger().warning(er.errorMessage);
                  return true;
                }
              }
            }
            if (!event.isCancelled()) {
              plot.addMember(allowed,Plot.AccessLevel.ALLOWED);
              plot.removeDenied(allowed);
              plugin.getSqlManager().savePlot(plot);
              player.sendMessage(C("String_Node_Str") + "String_Node_Str" + allowed+ "String_Node_Str"+ C("String_Node_Str"));
              if (isAdvancedLogging()) {
                if (price == 0) {
                  serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ allowed+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ plot.getId());
                }
 else {
                  serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ allowed+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ plot.getId()+ ("String_Node_Str" + C("String_Node_Str") + "String_Node_Str"+ price));
                }
              }
            }
          }
        }
 else {
          player.sendMessage(C("String_Node_Str") + "String_Node_Str" + plot.getId()+ "String_Node_Str"+ C("String_Node_Str"));
        }
      }
 else {
        player.sendMessage(C("String_Node_Str"));
      }
    }
 else {
      player.sendMessage(C("String_Node_Str"));
      return true;
    }
  }
 else {
    return false;
  }
  return true;
}

Fixed version (ground truth):
public boolean execute(ICommandSender sender,String[] args){
  if (args.length < 2 && args.length >= 3) {
    sender.sendMessage(getUsage());
    return true;
  }
  if ("String_Node_Str".equals(args[1]) && plugin.getConfig().getBoolean("String_Node_Str")) {
    sender.sendMessage(C("String_Node_Str"));
    return true;
  }
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.ADMIN_ADD) || player.hasPermission(PermissionNames.USER_ADD)) {
    IWorld world=player.getWorld();
    if (manager.isPlotWorld(player)) {
      PlotMapInfo pmi=manager.getMap(world);
      Plot plot=manager.getPlot(player);
      if (plot != null) {
        String allowed;
        if ("String_Node_Str".equals(args[1])) {
          allowed="String_Node_Str";
        }
 else {
          if (serverBridge.getPlayer(args[1]) != null) {
            allowed=serverBridge.getPlayer(args[1]).getUniqueId().toString();
          }
 else {
            player.sendMessage(String.format("String_Node_Str",args[1]));
            return true;
          }
        }
        if (player.getUniqueId().equals(plot.getOwnerId()) || player.hasPermission(PermissionNames.ADMIN_ADD)) {
          if (plot.isMember(allowed).isPresent()) {
            player.sendMessage(C("String_Node_Str",args[1]));
          }
 else {
            PlotAddTrustedEvent event=new PlotAddTrustedEvent(plot,player,allowed);
            plugin.getEventBus().post(event);
            double price=0.0;
            if (manager.isEconomyEnabled(pmi)) {
              price=pmi.getAddPlayerPrice();
              if (serverBridge.has(player,pmi.getAddPlayerPrice())) {
                player.sendMessage("String_Node_Str" + serverBridge.getEconomy().get().format(price) + "String_Node_Str"+ "String_Node_Str");
                return true;
              }
 else               if (!event.isCancelled()) {
                EconomyResponse er=serverBridge.withdrawPlayer(player,price);
                if (!er.transactionSuccess()) {
                  player.sendMessage(er.errorMessage);
                  serverBridge.getLogger().warning(er.errorMessage);
                  return true;
                }
              }
            }
            if (!event.isCancelled()) {
              plot.addMember(allowed,Plot.AccessLevel.ALLOWED);
              plot.removeDenied(allowed);
              plugin.getSqlManager().savePlot(plot);
              player.sendMessage(C("String_Node_Str") + "String_Node_Str" + args[1]+ "String_Node_Str"+ C("String_Node_Str"));
              if (isAdvancedLogging()) {
                if (price == 0) {
                  serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ args[1]+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ plot.getId());
                }
 else {
                  serverBridge.getLogger().info(player.getName() + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ args[1]+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ plot.getId()+ ("String_Node_Str" + C("String_Node_Str") + "String_Node_Str"+ price));
                }
              }
            }
          }
        }
 else {
          player.sendMessage(C("String_Node_Str") + "String_Node_Str" + plot.getId()+ "String_Node_Str"+ C("String_Node_Str"));
        }
      }
 else {
        player.sendMessage(C("String_Node_Str"));
      }
    }
 else {
      player.sendMessage(C("String_Node_Str"));
      return true;
    }
  }
 else {
    return false;
  }
  return true;
}