title: Segmentation fault when running 'bundle exec rake'
body: <p>After running:</p>
  
  <p><code>$ bundle exec rake</code></p>
  
  <p>I receive this error: </p>
  
  <pre><code>/Users/user/Documents/Code/spree_gem/vendor/bundle/gems/json-
  1.8.2/lib/json/ext/parser.bundle: [BUG] Segmentation fault at 0x00000000000418 
  ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64darwin14.0]
  </code></pre>
  
  <p>Along with this:</p>
  
  <pre><code>/Users/user/Documents/Code/spree_gem/vendor/bundle/bin/rake:23
  :in `&lt;main&gt;'
  /Users/user/Documents/Code/spree_gem/vendor/bundle/bin/rake:23
  :in `load'
  /Users/user/Documents/Code/spree_gem/vendor/bundle/gems/rake-
  10.4.2/bin/rake:33:in `&lt;top (required)&gt;'
  </code></pre>
  
  <p>I've tried <code>$ gem pristine --all</code>. Any thoughts?</p>