Program: 10477
Project: 10477
Buggy source:
@EventHandler public void locationTags(ReplaceableTagEvent event){
  if (!event.matches("String_Node_Str"))   return;
  String nameContext=event.getNameContext() != null ? event.getNameContext().toUpperCase() : "String_Node_Str";
  String type=event.getType() != null ? event.getType().toUpperCase() : "String_Node_Str";
  String subType=event.getSubType() != null ? event.getSubType().toUpperCase() : "String_Node_Str";
  String typeContext=event.getTypeContext() != null ? event.getTypeContext().toUpperCase() : "String_Node_Str";
  Location fromLocation=null;
  Location toLocation=null;
  if (aH.matchesLocation("String_Node_Str" + nameContext)) {
    fromLocation=aH.getLocationFrom("String_Node_Str" + nameContext);
  }
 else   if (event.getPlayer() != null) {
    fromLocation=new Location(event.getPlayer().getLocation());
  }
 else {
    fromLocation=new Location(event.getNPC().getLocation());
  }
  if (aH.matchesLocation("String_Node_Str" + typeContext)) {
    toLocation=aH.getLocationFrom("String_Node_Str" + typeContext);
  }
  if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     event.setReplaced(fromLocation.getBlock().getBiome().name().toLowerCase().replace('_',' '));
 else     event.setReplaced(fromLocation.getBlock().getBiome().name());
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(Utilities.getCardinal(Utilities.getYaw(toLocation.toVector().subtract(fromLocation.toVector()).normalize())));
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf(Math.abs(fromLocation.getY() - toLocation.getY())));
 else     if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf(Math.sqrt(Math.pow(fromLocation.getX() - toLocation.getX(),2) + Math.pow(fromLocation.getZ() - toLocation.getZ(),2))));
 else     event.setReplaced(String.valueOf(fromLocation.distance(toLocation)));
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced("String_Node_Str" + fromLocation.getBlockX() + "String_Node_Str"+ fromLocation.getBlockY()+ "String_Node_Str"+ fromLocation.getBlockZ()+ "String_Node_Str"+ fromLocation.getWorld().getName()+ "String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightFromBlocks()));
 else     if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightFromSky()));
 else     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightLevel()));
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     if (fromLocation.getWorld().getTime() < 13500 || fromLocation.getWorld().getTime() > 23000)     event.setReplaced("String_Node_Str");
 else     if (fromLocation.getWorld().getTime() > 13500)     event.setReplaced("String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(fromLocation.getWorld().getName());
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockX()));
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockY()));
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockZ()));
  }
}

Fixed version (ground truth):
@EventHandler public void locationTags(ReplaceableTagEvent event){
  if (!event.matches("String_Node_Str"))   return;
  String nameContext=event.getNameContext() != null ? event.getNameContext().toUpperCase() : "String_Node_Str";
  String type=event.getType() != null ? event.getType().toUpperCase() : "String_Node_Str";
  String subType=event.getSubType() != null ? event.getSubType().toUpperCase() : "String_Node_Str";
  String typeContext=event.getTypeContext() != null ? event.getTypeContext().toUpperCase() : "String_Node_Str";
  Location fromLocation=null;
  Location toLocation=null;
  if (aH.matchesLocation("String_Node_Str" + nameContext)) {
    fromLocation=aH.getLocationFrom("String_Node_Str" + nameContext);
  }
 else   if (event.getPlayer() != null) {
    fromLocation=new Location(event.getPlayer().getLocation());
  }
 else {
    fromLocation=new Location(event.getNPC().getLocation());
  }
  if (aH.matchesLocation("String_Node_Str" + typeContext)) {
    toLocation=aH.getLocationFrom("String_Node_Str" + typeContext);
  }
  if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     event.setReplaced(fromLocation.getBlock().getBiome().name().toLowerCase().replace('_',' '));
 else     event.setReplaced(fromLocation.getBlock().getBiome().name());
  }
 else   if (type.equals("String_Node_Str")) {
    if (fromLocation != null && toLocation != null) {
      event.setReplaced(Utilities.getCardinal(Utilities.getYaw(toLocation.toVector().subtract(fromLocation.toVector()).normalize())));
    }
  }
 else   if (type.equals("String_Node_Str")) {
    if (fromLocation != null && toLocation != null) {
      if (subType.equals("String_Node_Str"))       event.setReplaced(String.valueOf(Math.abs(fromLocation.getY() - toLocation.getY())));
 else       if (subType.equals("String_Node_Str"))       event.setReplaced(String.valueOf(Math.sqrt(Math.pow(fromLocation.getX() - toLocation.getX(),2) + Math.pow(fromLocation.getZ() - toLocation.getZ(),2))));
 else       event.setReplaced(String.valueOf(fromLocation.distance(toLocation)));
    }
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced("String_Node_Str" + fromLocation.getBlockX() + "String_Node_Str"+ fromLocation.getBlockY()+ "String_Node_Str"+ fromLocation.getBlockZ()+ "String_Node_Str"+ fromLocation.getWorld().getName()+ "String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightFromBlocks()));
 else     if (subType.equals("String_Node_Str"))     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightFromSky()));
 else     event.setReplaced(String.valueOf((int)fromLocation.getBlock().getLightLevel()));
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     if (fromLocation.getWorld().getTime() < 13500 || fromLocation.getWorld().getTime() > 23000)     event.setReplaced("String_Node_Str");
 else     if (fromLocation.getWorld().getTime() > 13500)     event.setReplaced("String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(fromLocation.getWorld().getName());
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockX()));
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockY()));
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(String.valueOf(fromLocation.getBlockZ()));
  }
}