Program: 10363
Project: 10363
Buggy source:
@Override public String getAttribute(Attribute attribute){
  if (attribute == null)   return "String_Node_Str";
  if (attribute.startsWith("String_Node_Str"))   return new Element(getCitizen().hasTrait(NicknameTrait.class) ? getCitizen().getTrait(NicknameTrait.class).getNickname() : getName()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(ChatColor.stripColor(getName())).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    List<String> list=new ArrayList<String>();
    for (    Trait trait : getCitizen().getTraits())     list.add(trait.getName());
    return new dList(list).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1)) {
      Class<? extends Trait> trait=CitizensAPI.getTraitFactory().getTraitClass(attribute.getContext(1));
      if (trait != null)       return new Element(getCitizen().hasTrait(trait)).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str")) {
    List<String> list=new ArrayList<String>();
    for (    Anchor anchor : getCitizen().getTrait(Anchors.class).getAnchors())     list.add(anchor.getName());
    return new dList(list).getAttribute(attribute.fulfill(2));
  }
  if (attribute.startsWith("String_Node_Str")) {
    return (new Element(getCitizen().getTrait(Anchors.class).getAnchors().size() > 0)).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1) && getCitizen().getTrait(Anchors.class).getAnchor(attribute.getContext(1)) != null)     return new dLocation(getCitizen().getTrait(Anchors.class).getAnchor(attribute.getContext(1)).getLocation()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    String flag_name;
    if (attribute.hasContext(1))     flag_name=attribute.getContext(1);
 else     return "String_Node_Str";
    attribute.fulfill(1);
    if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str"))     return new Element(!FlagManager.npcHasFlag(this,flag_name)).getAttribute(attribute.fulfill(1));
    if (attribute.startsWith("String_Node_Str") && !FlagManager.npcHasFlag(this,flag_name))     return new Element(0).getAttribute(attribute.fulfill(1));
    if (FlagManager.npcHasFlag(this,flag_name))     return new dList(DenizenAPI.getCurrentInstance().flagManager().getNPCFlag(getId(),flag_name)).getAttribute(attribute);
 else     return "String_Node_Str";
  }
  if (attribute.startsWith("String_Node_Str"))   return new Element(getId()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getOwner()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new dInventory(getEntity()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(isSpawned()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return (NPCTags.previousLocations.containsKey(getId()) ? NPCTags.previousLocations.get(getId()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (!citizen.hasTrait(AssignmentTrait.class) || !citizen.getTrait(AssignmentTrait.class).hasAssignment()) {
      return "String_Node_Str";
    }
 else {
      return new Element(citizen.getTrait(AssignmentTrait.class).getAssignment().getName()).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().isNavigating()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().speed()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().range()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().attackStrategy().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().speedModifier()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().baseSpeed()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().avoidWater()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getTargetAsLocation() != null ? new dLocation(getNavigator().getTargetAsLocation()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getEntityTarget().isAggressive()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getTargetType().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getEntityTarget().getTarget() != null ? new dEntity(getNavigator().getEntityTarget().getTarget()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  return (getEntity() != null ? new dEntity(getEntity()).getAttribute(attribute) : new Element(identify()).getAttribute(attribute));
}

Fixed version (ground truth):
@Override public String getAttribute(Attribute attribute){
  if (attribute == null)   return "String_Node_Str";
  if (attribute.startsWith("String_Node_Str"))   return new Element(getCitizen().hasTrait(NicknameTrait.class) ? getCitizen().getTrait(NicknameTrait.class).getNickname() : getName()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(ChatColor.stripColor(getName())).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    List<String> list=new ArrayList<String>();
    for (    Trait trait : getCitizen().getTraits())     list.add(trait.getName());
    return new dList(list).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1)) {
      Class<? extends Trait> trait=CitizensAPI.getTraitFactory().getTraitClass(attribute.getContext(1));
      if (trait != null)       return new Element(getCitizen().hasTrait(trait)).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str")) {
    List<String> list=new ArrayList<String>();
    for (    Anchor anchor : getCitizen().getTrait(Anchors.class).getAnchors())     list.add(anchor.getName());
    return new dList(list).getAttribute(attribute.fulfill(2));
  }
  if (attribute.startsWith("String_Node_Str")) {
    return (new Element(getCitizen().getTrait(Anchors.class).getAnchors().size() > 0)).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1) && getCitizen().getTrait(Anchors.class).getAnchor(attribute.getContext(1)) != null)     return new dLocation(getCitizen().getTrait(Anchors.class).getAnchor(attribute.getContext(1)).getLocation()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    String flag_name;
    if (attribute.hasContext(1))     flag_name=attribute.getContext(1);
 else     return "String_Node_Str";
    attribute.fulfill(1);
    if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str"))     return new Element(!FlagManager.npcHasFlag(this,flag_name)).getAttribute(attribute.fulfill(1));
    if (attribute.startsWith("String_Node_Str") && !FlagManager.npcHasFlag(this,flag_name))     return new Element(0).getAttribute(attribute.fulfill(1));
    if (FlagManager.npcHasFlag(this,flag_name))     return new dList(DenizenAPI.getCurrentInstance().flagManager().getNPCFlag(getId(),flag_name)).getAttribute(attribute);
 else     return "String_Node_Str";
  }
  if (attribute.startsWith("String_Node_Str"))   return new Element(getId()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getOwner()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new dInventory(getEntity()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(isSpawned()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return (NPCTags.previousLocations.containsKey(getId()) ? NPCTags.previousLocations.get(getId()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (!citizen.hasTrait(AssignmentTrait.class) || !citizen.getTrait(AssignmentTrait.class).hasAssignment()) {
      return "String_Node_Str";
    }
 else {
      return new Element(citizen.getTrait(AssignmentTrait.class).getAssignment().getName()).getAttribute(attribute.fulfill(1));
    }
  }
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().isNavigating()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().speed()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().range()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().attackStrategy().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().speedModifier()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().baseSpeed()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getLocalParameters().avoidWater()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getTargetAsLocation() != null ? new dLocation(getNavigator().getTargetAsLocation()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getEntityTarget().isAggressive()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getTargetType().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getEntityTarget().getTarget() != null ? new dEntity(getNavigator().getEntityTarget().getTarget()).getAttribute(attribute.fulfill(2)) : "String_Node_Str");
  return (getEntity() != null ? new dEntity(getCitizen()).getAttribute(attribute) : new Element(identify()).getAttribute(attribute));
}