Program: 10354
Project: 10354
Buggy source:
@EventHandler public void listen(EntityDeathEvent event){
  if (event.getEntity().getKiller() != player.getPlayerEntity())   return;
  if (region != null)   if (!WorldGuardUtilities.inRegion(player.getLocation(),region))   return;
  if (cuboid != null)   if (!cuboid.isInsideCuboid(player.getLocation()))   return;
  if (type == KillType.ENTITY) {
    dEntity ent=new dEntity(event.getEntity());
    boolean count_it=false;
    for (    String target : targets) {
      if (dEntity.valueOf(target) != null)       if (ent.comparesTo(dEntity.valueOf(target)) == 1)       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + ent.identify()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.NPC) {
    if (!CitizensAPI.getNPCRegistry().isNPC(event.getEntity()))     return;
    dNPC npc=dNPC.mirrorCitizensNPC(CitizensAPI.getNPCRegistry().getNPC(event.getEntity()));
    boolean count_it=false;
    for (    String target : targets) {
      if (dNPC.valueOf(target) != null) {
        if (dNPC.valueOf(target).getId() == npc.getId())         count_it=true;
      }
 else       if (npc.getName().equalsIgnoreCase(target))       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + npc.toString()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.PLAYER) {
    if (event.getEntityType() != EntityType.PLAYER)     return;
    if (CitizensAPI.getNPCRegistry().isNPC(event.getEntity()))     return;
    dPlayer player=dPlayer.mirrorBukkitPlayer((Player)event.getEntity());
    boolean count_it=false;
    for (    String target : targets) {
      if (dPlayer.valueOf(target) != null)       if (dPlayer.valueOf(target).getName().equalsIgnoreCase(player.getName()))       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + player.getName()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.GROUP) {
    if (event.getEntityType() == EntityType.PLAYER)     for (    String group : Depends.permissions.getPlayerGroups((Player)event.getEntity()))     if (targets.contains(group.toUpperCase())) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + ((Player)event.getEntity()).getName().toUpperCase()+ "String_Node_Str"+ group+ "String_Node_Str");
      check();
      break;
    }
  }
}

Fixed version (ground truth):
@EventHandler public void listen(EntityDeathEvent event){
  if (event.getEntity().getKiller() != player.getPlayerEntity())   return;
  if (region != null)   if (!WorldGuardUtilities.inRegion(player.getLocation(),region))   return;
  if (cuboid != null)   if (!cuboid.isInsideCuboid(player.getLocation()))   return;
  if (type == KillType.ENTITY) {
    dEntity ent=new dEntity(event.getEntity());
    boolean count_it=false;
    for (    String target : targets) {
      if (dEntity.valueOf(target) != null)       if (ent.comparesTo(dEntity.valueOf(target)) == 1)       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + ent.identify()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.NPC) {
    if (!CitizensAPI.getNPCRegistry().isNPC(event.getEntity()))     return;
    dNPC npc=dNPC.mirrorCitizensNPC(CitizensAPI.getNPCRegistry().getNPC(event.getEntity()));
    boolean count_it=false;
    for (    String target : targets) {
      if (dNPC.valueOf(target) != null) {
        if (dNPC.valueOf(target).getId() == npc.getId())         count_it=true;
      }
      if (npc.getName().equalsIgnoreCase(target.toLowerCase().replace("String_Node_Str","String_Node_Str")))       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + npc.toString()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.PLAYER) {
    if (event.getEntityType() != EntityType.PLAYER)     return;
    if (CitizensAPI.getNPCRegistry().isNPC(event.getEntity()))     return;
    dPlayer player=dPlayer.mirrorBukkitPlayer((Player)event.getEntity());
    boolean count_it=false;
    for (    String target : targets) {
      if (dPlayer.valueOf(target) != null)       if (dPlayer.valueOf(target).getName().equalsIgnoreCase(player.getName()))       count_it=true;
    }
    if (count_it || targets.contains("String_Node_Str")) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + player.getName()+ "String_Node_Str"+ kills_so_far+ "String_Node_Str"+ required+ "String_Node_Str");
      check();
    }
  }
 else   if (type == KillType.GROUP) {
    if (event.getEntityType() == EntityType.PLAYER)     for (    String group : Depends.permissions.getPlayerGroups((Player)event.getEntity()))     if (targets.contains(group.toUpperCase())) {
      kills_so_far++;
      dB.log(player.getName() + "String_Node_Str" + ((Player)event.getEntity()).getName().toUpperCase()+ "String_Node_Str"+ group+ "String_Node_Str");
      check();
      break;
    }
  }
}