Program: 10190
Project: 10190
Buggy source:
@EventHandler public void entityDeath(EntityDeathEvent event){
  dPlayer player=null;
  dNPC npc=null;
  Map<String,dObject> context=new HashMap<String,dObject>();
  dEntity entity=new dEntity(event.getEntity());
  context.put("String_Node_Str",entity.getDenizenObject());
  if (event.getEntity().getLastDamageCause() != null)   context.put("String_Node_Str",new Element(event.getEntity().getLastDamageCause().getCause().toString()));
  dList drops_dlist=new dList();
  for (  ItemStack stack : event.getDrops()) {
    if (stack == null) {
      drops_dlist.add("String_Node_Str");
    }
 else {
      drops_dlist.add(new dItem(stack).identify());
    }
  }
  context.put("String_Node_Str",drops_dlist);
  if (entity.isCitizensNPC())   npc=entity.getDenizenNPC();
 else   if (entity.isPlayer())   player=entity.getDenizenPlayer();
  EntityDamageEvent lastDamage=entity.getBukkitEntity().getLastDamageCause();
  if (lastDamage != null && lastDamage instanceof EntityDamageByEntityEvent) {
    context.put("String_Node_Str",new dEntity(((EntityDamageByEntityEvent)lastDamage).getDamager()).getDenizenObject());
  }
  PlayerDeathEvent subEvent=null;
  if (event instanceof PlayerDeathEvent) {
    subEvent=(PlayerDeathEvent)event;
    context.put("String_Node_Str",new Element(subEvent.getDeathMessage()));
    if (player != null)     context.put("String_Node_Str",player.getInventory());
  }
  List<String> determinations=OldEventManager.doEvents(Arrays.asList("String_Node_Str",entity.identifyType() + "String_Node_Str",entity.identifySimple() + "String_Node_Str",entity.identifySimple() + "String_Node_Str","String_Node_Str",entity.identifyType() + "String_Node_Str"),new BukkitScriptEntryData(player,npc),context,true);
  for (  String determination : determinations) {
    if (determination.toUpperCase().startsWith("String_Node_Str")) {
      determination=determination.substring(6);
    }
    if (determination.toUpperCase().startsWith("String_Node_Str")) {
      event.getDrops().clear();
      if (determination.endsWith("String_Node_Str")) {
        event.setDroppedExp(0);
      }
    }
 else     if (determination.toUpperCase().equals("String_Node_Str")) {
      event.setDroppedExp(0);
    }
 else     if (aH.Argument.valueOf(determination).matchesPrimitive(aH.PrimitiveType.Integer)) {
      int xp=Integer.valueOf(determination.substring(3));
      event.setDroppedExp(xp);
    }
 else     if (aH.Argument.valueOf(determination).matchesArgumentList(dItem.class)) {
      dList drops=dList.valueOf(determination);
      drops.filter(dItem.class);
      event.getDrops().clear();
      for (      String drop : drops) {
        dItem item=dItem.valueOf(drop);
        if (item != null)         event.getDrops().add(item.getItemStack());
      }
    }
 else     if (!determination.toUpperCase().equals("String_Node_Str")) {
      if (event instanceof PlayerDeathEvent) {
        subEvent.setDeathMessage(determination);
      }
    }
  }
}

Fixed version (ground truth):
@EventHandler public void entityDeath(EntityDeathEvent event){
  dPlayer player=null;
  dNPC npc=null;
  Map<String,dObject> context=new HashMap<String,dObject>();
  dEntity entity=new dEntity(event.getEntity());
  context.put("String_Node_Str",entity.getDenizenObject());
  if (event.getEntity().getLastDamageCause() != null)   context.put("String_Node_Str",new Element(event.getEntity().getLastDamageCause().getCause().toString()));
  dList drops_dlist=new dList();
  for (  ItemStack stack : event.getDrops()) {
    if (stack == null) {
      drops_dlist.add("String_Node_Str");
    }
 else {
      drops_dlist.add(new dItem(stack).identify());
    }
  }
  context.put("String_Node_Str",drops_dlist);
  if (entity.isCitizensNPC())   npc=entity.getDenizenNPC();
 else   if (entity.isPlayer())   player=entity.getDenizenPlayer();
  EntityDamageEvent lastDamage=entity.getBukkitEntity().getLastDamageCause();
  if (lastDamage != null && lastDamage instanceof EntityDamageByEntityEvent) {
    context.put("String_Node_Str",new dEntity(((EntityDamageByEntityEvent)lastDamage).getDamager()).getDenizenObject());
  }
  PlayerDeathEvent subEvent=null;
  if (event instanceof PlayerDeathEvent) {
    subEvent=(PlayerDeathEvent)event;
    context.put("String_Node_Str",new Element(subEvent.getDeathMessage()));
    if (player != null)     context.put("String_Node_Str",player.getInventory());
  }
  List<String> determinations=OldEventManager.doEvents(Arrays.asList("String_Node_Str",entity.identifyType() + "String_Node_Str",entity.identifySimple() + "String_Node_Str",entity.identifySimple() + "String_Node_Str","String_Node_Str",entity.identifyType() + "String_Node_Str"),new BukkitScriptEntryData(player,npc),context,true);
  for (  String determination : determinations) {
    if (determination.toUpperCase().startsWith("String_Node_Str")) {
      determination=determination.substring(6);
    }
    if (determination.toUpperCase().startsWith("String_Node_Str")) {
      event.getDrops().clear();
      if (determination.endsWith("String_Node_Str")) {
        event.setDroppedExp(0);
      }
    }
 else     if (determination.toUpperCase().equals("String_Node_Str")) {
      event.setDroppedExp(0);
    }
 else     if (aH.Argument.valueOf(determination).matchesPrimitive(aH.PrimitiveType.Integer)) {
      int xp=Integer.valueOf(determination);
      event.setDroppedExp(xp);
    }
 else     if (aH.Argument.valueOf(determination).matchesArgumentList(dItem.class)) {
      dList drops=dList.valueOf(determination);
      drops.filter(dItem.class);
      event.getDrops().clear();
      for (      String drop : drops) {
        dItem item=dItem.valueOf(drop);
        if (item != null)         event.getDrops().add(item.getItemStack());
      }
    }
 else     if (!determination.toUpperCase().equals("String_Node_Str")) {
      if (event instanceof PlayerDeathEvent) {
        subEvent.setDeathMessage(determination);
      }
    }
  }
}