Nokogiri Segmentation fault?

I am trying to run a simple Ruby script from Railscast and once I run my program I get the following Segmentation fault bug error. I have tried uninstalling and reinstalling Nokogiri and LibXML and still nothing. Is there anyway to fix the Ruby 1.87 version? Maybe that is the problem?

$ ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.0]

/Users/da/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.4.4/lib/nokogiri/nokogiri.bundle:
[BUG] Segmentation fault ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]

Abort trap $ ruby -v ruby 1.9.2p180
(2011-02-18 revision 30909)
[x86_64-darwin10.7.0] $ bundle exec
nokogiri -v—
---  warnings: []

nokogiri: 1.4.4
ruby:
  version: 1.9.2
  platform: x86_64-darwin10.7.0
  engine: ruby
libxml:
  binding: extension
  compiled: 2.7.7
  loaded: 2.7.7

This is the code I used:

#!/usr/bin/ruby -w

require 'rubygems'
require 'nokogiri'
require 'open-uri'

url = "http://www.walmart.com/search/search-ng.do?search_constraint=0&ic=48_0&search_query=batman&Find.x=0&Find.y=0&Find=Find"
doc = Nokogiri::HTML(open(url))
puts doc.at_css("title").text
doc.css(".item").each do |item|
  title = item.at_css(".prodLink").text
  price = item.at_css(".PriceCompare .BodyS, .PriceXLBold").text[/\$[0-9\.]+/]
  puts "#{title} - #{price}"
  puts item.at_css(".prodLink")[:href]
end