Program: 41996
Project: 41996
Buggy source:
public boolean execute(ICommandSender sender,String[] args) throws Exception {
  if (args.length < 2 && args.length >= 3) {
    throw new BadUsageException(getUsage());
  }
  if (args[1].length() > 16 || !validUserPattern.matcher(args[1]).matches()) {
    throw new IllegalArgumentException(C("String_Node_Str"));
  }
  if ("String_Node_Str".equalsIgnoreCase(args[1]) && plugin.getConfig().getBoolean("String_Node_Str")) {
    sender.sendMessage("String_Node_Str");
    return true;
  }
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.ADMIN_REMOVE) || player.hasPermission(PermissionNames.USER_REMOVE)) {
    IWorld world=player.getWorld();
    if (manager.isPlotWorld(world)) {
      PlotMapInfo pmi=manager.getMap(world);
      Plot plot=manager.getPlot(player);
      if (plot == null) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
 else {
        UUID playerUniqueId=player.getUniqueId();
        String allowed=args[1];
        if (plot.getOwnerId().equals(playerUniqueId) || player.hasPermission(PermissionNames.ADMIN_REMOVE)) {
          if (plot.isAllowedConsulting(allowed)) {
            double price=0.0;
            PlotRemoveAllowedEvent event=new PlotRemoveAllowedEvent(world,plot,player,allowed);
            serverBridge.getEventBus().post(event);
            if (manager.isEconomyEnabled(pmi) && !event.isCancelled()) {
              price=pmi.getRemovePlayerPrice();
              if (serverBridge.has(player,price)) {
                EconomyResponse er=serverBridge.withdrawPlayer(player,price);
                if (!er.transactionSuccess()) {
                  player.sendMessage(er.errorMessage);
                  serverBridge.getLogger().warning(er.errorMessage);
                  return true;
                }
              }
 else {
                player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().format(price));
                return true;
              }
            }
            if (!event.isCancelled()) {
              if ("String_Node_Str".equalsIgnoreCase(allowed)) {
                plot.removeAllAllowed();
              }
 else {
                plot.removeAllowed(allowed);
              }
              player.sendMessage(C("String_Node_Str") + "String_Node_Str" + allowed+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().format(price));
              if (isAdvancedLogging()) {
                if (price == 0) {
                  serverBridge.getLogger().info(allowed + "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(allowed + "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" + args[1]+ "String_Node_Str"+ C("String_Node_Str"));
          }
        }
 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 {
    return false;
  }
  return true;
}

Fixed version (ground truth):
public boolean execute(ICommandSender sender,String[] args) throws Exception {
  if (args.length < 2 && args.length >= 3) {
    throw new BadUsageException(getUsage());
  }
  if (args[1].length() > 16 || !validUserPattern.matcher(args[1]).matches()) {
    throw new IllegalArgumentException(C("String_Node_Str"));
  }
  if ("String_Node_Str".equals(args[1]) && plugin.getConfig().getBoolean("String_Node_Str")) {
    sender.sendMessage("String_Node_Str");
    return true;
  }
  IPlayer player=(IPlayer)sender;
  if (player.hasPermission(PermissionNames.ADMIN_REMOVE) || player.hasPermission(PermissionNames.USER_REMOVE)) {
    IWorld world=player.getWorld();
    if (manager.isPlotWorld(world)) {
      PlotMapInfo pmi=manager.getMap(world);
      Plot plot=manager.getPlot(player);
      if (plot == null) {
        player.sendMessage(C("String_Node_Str"));
        return true;
      }
 else {
        UUID playerUniqueId=player.getUniqueId();
        String allowed=args[1];
        if (plot.getOwnerId().equals(playerUniqueId) || player.hasPermission(PermissionNames.ADMIN_REMOVE)) {
          if (plot.isAllowedConsulting(allowed)) {
            double price=0.0;
            PlotRemoveAllowedEvent event=new PlotRemoveAllowedEvent(world,plot,player,allowed);
            serverBridge.getEventBus().post(event);
            if (manager.isEconomyEnabled(pmi) && !event.isCancelled()) {
              price=pmi.getRemovePlayerPrice();
              if (serverBridge.has(player,price)) {
                EconomyResponse er=serverBridge.withdrawPlayer(player,price);
                if (!er.transactionSuccess()) {
                  player.sendMessage(er.errorMessage);
                  serverBridge.getLogger().warning(er.errorMessage);
                  return true;
                }
              }
 else {
                player.sendMessage(C("String_Node_Str") + "String_Node_Str" + C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
                return true;
              }
            }
            if (!event.isCancelled()) {
              if ("String_Node_Str".equals(allowed)) {
                plot.removeAllAllowed();
              }
 else {
                plot.removeAllowed(allowed);
              }
              player.sendMessage(C("String_Node_Str") + "String_Node_Str" + allowed+ "String_Node_Str"+ C("String_Node_Str")+ "String_Node_Str"+ serverBridge.getEconomy().get().format(price));
              if (isAdvancedLogging()) {
                if (price == 0) {
                  serverBridge.getLogger().info(allowed + "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(allowed + "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" + args[1]+ "String_Node_Str"+ C("String_Node_Str"));
          }
        }
 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 {
    return false;
  }
  return true;
}