Program: 10362
Project: 10362
Buggy source:
public String getAttribute(Attribute attribute){
  if (attribute == null)   return null;
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1))) {
      int qty=1;
      if (attribute.getAttribute(2).startsWith("String_Node_Str") && attribute.hasContext(2) && aH.matchesInteger(attribute.getContext(2))) {
        qty=attribute.getIntContext(2);
      }
      return new Element(getInventory().containsAtLeast(dItem.valueOf(attribute.getContext(1)).getItemStack(),qty)).getAttribute(attribute.fulfill(qty == 1 ? 1 : 2));
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    return new dLocation(getLocation()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1)))   return new Element(count(dItem.valueOf(attribute.getContext(1)).getItemStack(),false)).getAttribute(attribute.fulfill(1));
 else   return new Element(count(null,false)).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getSize()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1)))   return new Element(count(dItem.valueOf(attribute.getContext(1)).getItemStack(),true)).getAttribute(attribute.fulfill(1));
 else   return new Element(count(null,true)).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getInventory().getType().name()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    if (getInventory() instanceof PlayerInventory) {
      String identifier=null;
      if (CitizensAPI.getNPCRegistry().isNPC((LivingEntity)getInventory().getHolder())) {
        if (inventory.getHolder() instanceof Player)         identifier="String_Node_Str" + CitizensAPI.getNPCRegistry().getNPC((LivingEntity)getInventory().getHolder()).getId();
 else         return new Element("String_Node_Str").getAttribute(attribute.fulfill(1));
      }
 else       if (inventory.getHolder() instanceof Player)       identifier="String_Node_Str" + ((Player)getInventory().getHolder()).getName();
 else       if (inventory.getHolder() instanceof LivingEntity)       identifier="String_Node_Str" + ((Player)getInventory().getHolder()).getEntityId();
 else       return new Element("String_Node_Str").getAttribute(attribute.fulfill(1));
      return new dInventory(InventoryType.CRAFTING,"String_Node_Str",identifier).add(((PlayerInventory)getInventory()).getArmorContents()).getAttribute(attribute.fulfill(1));
    }
 else     if (getInventory() instanceof HorseInventory) {
      return new dInventory(InventoryType.CRAFTING,"String_Node_Str",(getInventory().getHolder() != null ? "String_Node_Str" + String.valueOf(((LivingEntity)getInventory().getHolder()).getEntityId()) : getInventory().getName())).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    ArrayList<dItem> items=new ArrayList<dItem>();
    for (    ItemStack item : getContents()) {
      if (item != null && item.getType() != Material.AIR)       items.add(new dItem(item));
    }
    return new dList(items).getAttribute(attribute.fulfill(1));
  }
  return new Element(identify()).getAttribute(attribute);
}

Fixed version (ground truth):
public String getAttribute(Attribute attribute){
  if (attribute == null)   return null;
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1))) {
      int qty=1;
      int attribs=1;
      if (attribute.getAttribute(2).startsWith("String_Node_Str") && attribute.hasContext(2) && aH.matchesInteger(attribute.getContext(2))) {
        qty=attribute.getIntContext(2);
        attribs=2;
      }
      return new Element(getInventory().containsAtLeast(dItem.valueOf(attribute.getContext(1)).getItemStack(),qty)).getAttribute(attribute.fulfill(attribs));
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    return new dLocation(getLocation()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1)))   return new Element(count(dItem.valueOf(attribute.getContext(1)).getItemStack(),false)).getAttribute(attribute.fulfill(1));
 else   return new Element(count(null,false)).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getSize()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   if (attribute.hasContext(1) && dItem.matches(attribute.getContext(1)))   return new Element(count(dItem.valueOf(attribute.getContext(1)).getItemStack(),true)).getAttribute(attribute.fulfill(1));
 else   return new Element(count(null,true)).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getInventory().getType().name()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    if (getInventory() instanceof PlayerInventory) {
      String identifier=null;
      if (CitizensAPI.getNPCRegistry().isNPC((LivingEntity)getInventory().getHolder())) {
        if (inventory.getHolder() instanceof Player)         identifier="String_Node_Str" + CitizensAPI.getNPCRegistry().getNPC((LivingEntity)getInventory().getHolder()).getId();
 else         return new Element("String_Node_Str").getAttribute(attribute.fulfill(1));
      }
 else       if (inventory.getHolder() instanceof Player)       identifier="String_Node_Str" + ((Player)getInventory().getHolder()).getName();
 else       if (inventory.getHolder() instanceof LivingEntity)       identifier="String_Node_Str" + ((Player)getInventory().getHolder()).getEntityId();
 else       return new Element("String_Node_Str").getAttribute(attribute.fulfill(1));
      return new dInventory(InventoryType.CRAFTING,"String_Node_Str",identifier).add(((PlayerInventory)getInventory()).getArmorContents()).getAttribute(attribute.fulfill(1));
    }
 else     if (getInventory() instanceof HorseInventory) {
      return new dInventory(InventoryType.CRAFTING,"String_Node_Str",(getInventory().getHolder() != null ? "String_Node_Str" + String.valueOf(((LivingEntity)getInventory().getHolder()).getEntityId()) : getInventory().getName())).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    ArrayList<dItem> items=new ArrayList<dItem>();
    for (    ItemStack item : getContents()) {
      if (item != null && item.getType() != Material.AIR)       items.add(new dItem(item));
    }
    return new dList(items).getAttribute(attribute.fulfill(1));
  }
  return new Element(identify()).getAttribute(attribute);
}