Program: 10306
Project: 10306
Buggy source:
@Override public String getAttribute(Attribute attribute){
  if (attribute == null)   return "String_Node_Str";
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    return new Element(citizen.hasTrait(NicknameTrait.class) && citizen.getTrait(NicknameTrait.class).hasNickname()).getAttribute(attribute.fulfill(1));
  }
  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 Element.NULL.getAttribute(attribute.fulfill(1));
    return new Element(FlagManager.npcHasFlag(this,flag_name)).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    String flag_name;
    if (attribute.hasContext(1))     flag_name=attribute.getContext(1);
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
    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 Element.NULL.getAttribute(attribute);
  }
  if (attribute.startsWith("String_Node_Str")) {
    String constant_name;
    if (attribute.hasContext(1)) {
      if (getCitizen().hasTrait(ConstantsTrait.class) && getCitizen().getTrait(ConstantsTrait.class).getConstant(attribute.getContext(1)) != null) {
        return new Element(getCitizen().getTrait(ConstantsTrait.class).getConstant(attribute.getContext(1))).getAttribute(attribute.fulfill(1));
      }
 else {
        return Element.NULL.getAttribute(attribute.fulfill(1));
      }
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1))     return new Element(getCitizen().getTrait(Poses.class).hasPose(attribute.getContext(1))).getAttribute(attribute.fulfill(1));
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1)) {
      Pose pose=getCitizen().getTrait(Poses.class).getPose(attribute.getContext(1));
      return new dLocation(org.bukkit.Bukkit.getWorlds().get(0),0,0,0,pose.getYaw(),pose.getPitch()).getAttribute(attribute.fulfill(1));
    }
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str"))   return new Element(isEngaged()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getId()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    if (dPlayer.matches(getOwner())) {
      return dPlayer.valueOf(getOwner()).getAttribute(attribute.fulfill(1));
    }
 else     return new Element(getOwner()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   return getDenizenEntity().getInventory().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 new Element(getCitizen().isProtected()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (citizen.hasTrait(LookClose.class)) {
      String lookclose=citizen.getTrait(LookClose.class).toString();
      lookclose=lookclose.substring(10,lookclose.length() - 1);
      return new Element(Boolean.valueOf(lookclose)).getAttribute(attribute.fulfill(1));
    }
    return Element.FALSE.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   return (NPCTags.previousLocations.containsKey(getId()) ? NPCTags.previousLocations.get(getId()).getAttribute(attribute.fulfill(2)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    return new Element(citizen.hasTrait(AssignmentTrait.class) && citizen.getTrait(AssignmentTrait.class).hasAssignment()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (!citizen.hasTrait(AssignmentTrait.class) || !citizen.getTrait(AssignmentTrait.class).hasAssignment()) {
      return Element.NULL.getAttribute(attribute.fulfill(1));
    }
 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)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getEntityTarget() != null && getNavigator().getEntityTarget().isAggressive()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getTargetType() == null ? Element.NULL.getAttribute(attribute.fulfill(2)) : getNavigator().getTargetType().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getEntityTarget() != null && getNavigator().getEntityTarget().getTarget() != null ? new dEntity(getNavigator().getEntityTarget().getTarget()).getAttribute(attribute.fulfill(2)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  for (  Property property : PropertyParser.getProperties(this)) {
    String returned=property.getAttribute(attribute);
    if (returned != null)     return returned;
  }
  return (getEntity() != null ? new dEntity(getCitizen()).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 Element.TRUE.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    return new Element(citizen.hasTrait(NicknameTrait.class) && citizen.getTrait(NicknameTrait.class).hasNickname()).getAttribute(attribute.fulfill(1));
  }
  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 Element.NULL.getAttribute(attribute.fulfill(1));
    return new Element(FlagManager.npcHasFlag(this,flag_name)).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    String flag_name;
    if (attribute.hasContext(1))     flag_name=attribute.getContext(1);
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
    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 Element.NULL.getAttribute(attribute);
  }
  if (attribute.startsWith("String_Node_Str")) {
    String constant_name;
    if (attribute.hasContext(1)) {
      if (getCitizen().hasTrait(ConstantsTrait.class) && getCitizen().getTrait(ConstantsTrait.class).getConstant(attribute.getContext(1)) != null) {
        return new Element(getCitizen().getTrait(ConstantsTrait.class).getConstant(attribute.getContext(1))).getAttribute(attribute.fulfill(1));
      }
 else {
        return Element.NULL.getAttribute(attribute.fulfill(1));
      }
    }
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1))     return new Element(getCitizen().getTrait(Poses.class).hasPose(attribute.getContext(1))).getAttribute(attribute.fulfill(1));
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    if (attribute.hasContext(1)) {
      Pose pose=getCitizen().getTrait(Poses.class).getPose(attribute.getContext(1));
      return new dLocation(org.bukkit.Bukkit.getWorlds().get(0),0,0,0,pose.getYaw(),pose.getPitch()).getAttribute(attribute.fulfill(1));
    }
 else     return Element.NULL.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str") || attribute.startsWith("String_Node_Str"))   return new Element(isEngaged()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getId()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    if (dPlayer.matches(getOwner())) {
      return dPlayer.valueOf(getOwner()).getAttribute(attribute.fulfill(1));
    }
 else     return new Element(getOwner()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   return getDenizenEntity().getInventory().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 new Element(getCitizen().isProtected()).getAttribute(attribute.fulfill(1));
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (citizen.hasTrait(LookClose.class)) {
      String lookclose=citizen.getTrait(LookClose.class).toString();
      lookclose=lookclose.substring(10,lookclose.length() - 1);
      return new Element(Boolean.valueOf(lookclose)).getAttribute(attribute.fulfill(1));
    }
    return Element.FALSE.getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str"))   return (NPCTags.previousLocations.containsKey(getId()) ? NPCTags.previousLocations.get(getId()).getAttribute(attribute.fulfill(2)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    return new Element(citizen.hasTrait(AssignmentTrait.class) && citizen.getTrait(AssignmentTrait.class).hasAssignment()).getAttribute(attribute.fulfill(1));
  }
  if (attribute.startsWith("String_Node_Str")) {
    NPC citizen=getCitizen();
    if (!citizen.hasTrait(AssignmentTrait.class) || !citizen.getTrait(AssignmentTrait.class).hasAssignment()) {
      return Element.NULL.getAttribute(attribute.fulfill(1));
    }
 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)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getEntityTarget() != null && getNavigator().getEntityTarget().isAggressive()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return new Element(getNavigator().getTargetType() == null ? Element.NULL.getAttribute(attribute.fulfill(2)) : getNavigator().getTargetType().toString()).getAttribute(attribute.fulfill(2));
  if (attribute.startsWith("String_Node_Str"))   return (getNavigator().getEntityTarget() != null && getNavigator().getEntityTarget().getTarget() != null ? new dEntity(getNavigator().getEntityTarget().getTarget()).getAttribute(attribute.fulfill(2)) : Element.NULL.getAttribute(attribute.fulfill(2)));
  for (  Property property : PropertyParser.getProperties(this)) {
    String returned=property.getAttribute(attribute);
    if (returned != null)     return returned;
  }
  return (getEntity() != null ? new dEntity(getCitizen()).getAttribute(attribute) : new Element(identify()).getAttribute(attribute));
}