react_on_rails: [Rails 3.2][v6.9.0] Parsing error when fetching ReactOnRails context from script tag

Hi,

I updated the gem to the version 6.9.0 so it can be compatible with the node module (6.9.0). I’m using it with Rails 3.2.

Unexpectedly, I got this parsing error:

Uncaught SyntaxError: Unexpected token i in JSON at position 18
    at JSON.parse (<anonymous>)
    at parseRailsContext (app.js:23226)
    at reactOnRailsPageLoaded (app.js:23235)
    at HTMLDocument.<anonymous> (app.js:23289)

This is the output I have in the script tag generated by the helper prepend_render_rails_context:

<script id="js-react-on-rails-context" type="application/json">
{
  inMailer: false,
  i18nLocale: fr,
  i18nDefaultLocale: fr,
  href: http://localhost:3000/,
  location: /,
  scheme: http,
  host: localhost,
  port: 3000,
  pathname: /,
  search: null,
  httpAcceptLanguage: fr,en;q=0.8,en-US;q=0.6,zh-CN;q=0.4,zh;q=0.2,tr;q=0.2,nl;q=0.2,it;q=0.2,de;q=0.2,es;q=0.2,
  serverSide: false
}
</script>

The generated output doesn’t seem to be formatted as json so it cannot be parsed correctly by the javascript. Is there something that I should have done in my configuration?

Thank you very much for your help (and your great great project)!