if (cl.getName().equalsIgnoreCase(name))
if (cl == null || cl.getName().equalsIgnoreCase(name))
  public static boolean is_subclass_of(Env env,				       @ReadOnly Value value,				       String name)  {    QuercusClass cl;        if (value instanceof StringValue)      cl = env.findClass(value.toString());    else      cl = value.getQuercusClass();    if (cl.getName().equalsIgnoreCase(name))      return false;    else      return cl.isA(name);  }