Program: 58077
Project: 58077
Buggy source:
@Override public void run(){
  for (  String world : PlotMain.getPlotWorldsString()) {
    if (!ExpireManager.updatingPlots.containsKey(world)) {
      ExpireManager.updatingPlots.put(world,false);
    }
    Boolean updating=ExpireManager.updatingPlots.get(world);
    if (updating) {
      return;
    }
    if (!expiredPlots.containsKey(world)) {
      updateExpired(world);
      return;
    }
    Set<Plot> plots=expiredPlots.get(world).keySet();
    if (plots == null || plots.size() == 0) {
      if (updateExpired(world)) {
        return;
      }
      continue;
    }
    Plot plot=plots.iterator().next();
    if (plot.owner != null) {
      if (UUIDHandler.uuidWrapper.getPlayer(plot.owner) != null) {
        expiredPlots.get(world).remove(plot);
        return;
      }
    }
    if (!isExpired(plot.owner)) {
      expiredPlots.get(world).remove(plot);
      return;
    }
    final PlotDeleteEvent event=new PlotDeleteEvent(world,plot.id);
    Bukkit.getServer().getPluginManager().callEvent(event);
    if (event.isCancelled()) {
      event.setCancelled(true);
      return;
    }
    for (    UUID helper : plot.helpers) {
      Player player=UUIDHandler.uuidWrapper.getPlayer(helper);
      if (player != null) {
        PlayerFunctions.sendMessage(player,C.PLOT_REMOVED_HELPER,plot.id.toString());
      }
    }
    final World worldobj=Bukkit.getWorld(world);
    final PlotManager manager=PlotMain.getPlotManager(world);
    manager.clearPlot(worldobj,plot,false);
    PlotHelper.removeSign(worldobj,plot);
    DBFunc.delete(world,plot);
    PlotMain.removePlot(world,plot.id,true);
    expiredPlots.get(world).remove(plot);
    PlotMain.sendConsoleSenderMessage("String_Node_Str" + plot.id);
    PlotMain.sendConsoleSenderMessage("String_Node_Str" + plot.world);
    if (plot.hasOwner()) {
      PlotMain.sendConsoleSenderMessage("String_Node_Str" + UUIDHandler.getName(plot.owner));
    }
 else {
      PlotMain.sendConsoleSenderMessage("String_Node_Str");
    }
    return;
  }
}

Fixed version (ground truth):
@Override public void run(){
  for (  String world : PlotMain.getPlotWorldsString()) {
    if (!ExpireManager.updatingPlots.containsKey(world)) {
      ExpireManager.updatingPlots.put(world,false);
    }
    Boolean updating=ExpireManager.updatingPlots.get(world);
    if (updating) {
      return;
    }
    if (!expiredPlots.containsKey(world)) {
      updateExpired(world);
      return;
    }
    Set<Plot> plots=expiredPlots.get(world).keySet();
    if (plots == null || plots.size() == 0) {
      if (updateExpired(world)) {
        return;
      }
      continue;
    }
    Plot plot=plots.iterator().next();
    if (plot.owner != null) {
      if (UUIDHandler.uuidWrapper.getPlayer(plot.owner) != null) {
        expiredPlots.get(world).remove(plot);
        return;
      }
    }
    if (!isExpired(plot.owner)) {
      expiredPlots.get(world).remove(plot);
      return;
    }
    final PlotDeleteEvent event=new PlotDeleteEvent(world,plot.id);
    Bukkit.getServer().getPluginManager().callEvent(event);
    if (event.isCancelled()) {
      event.setCancelled(true);
      return;
    }
    for (    UUID helper : plot.helpers) {
      Player player=UUIDHandler.uuidWrapper.getPlayer(helper);
      if (player != null) {
        PlayerFunctions.sendMessage(player,C.PLOT_REMOVED_HELPER,plot.id.toString());
      }
    }
    final World worldobj=Bukkit.getWorld(world);
    final PlotManager manager=PlotMain.getPlotManager(world);
    if (plot.settings.isMerged()) {
      Unlink.unlinkPlot(Bukkit.getWorld(world),plot);
    }
    manager.clearPlot(worldobj,plot,false);
    PlotHelper.removeSign(worldobj,plot);
    DBFunc.delete(world,plot);
    PlotMain.removePlot(world,plot.id,true);
    expiredPlots.get(world).remove(plot);
    PlotMain.sendConsoleSenderMessage("String_Node_Str" + plot.id);
    PlotMain.sendConsoleSenderMessage("String_Node_Str" + plot.world);
    if (plot.hasOwner()) {
      PlotMain.sendConsoleSenderMessage("String_Node_Str" + UUIDHandler.getName(plot.owner));
    }
 else {
      PlotMain.sendConsoleSenderMessage("String_Node_Str");
    }
    return;
  }
}