PHP Fatal error: Uncaught Error: Call to a member function get_default_language

Hi,

I realized that this plugin causes my WordPress page to die. This happens only if I change the plugins settings:

1. Open plugin settings
2. Go to “General” tab
3. In Description settings, change Homepage description from “Website tagline” to “Custom text”
4. Enter whatever you like as custom text

Actual Result
Worpress processes the page only partly, PHP seems to die when WP Total Cache magic happens. Blank Page.

PHP Error:

mod_fcgid: stderr: PHP Fatal error:  Uncaught Error: Call to a member function get_default_language() on null in /path/to/wp-content/plugins/wonderm00ns-simple-facebook-open-graph-tags/public/class-webdados-fb-open-graph-public.php:84
mod_fcgid: stderr: Stack trace:
mod_fcgid: stderr: #0 /path/to/wp-includes/class-wp-hook.php(298): Webdados_FB_Public->insert_meta_tags('')
mod_fcgid: stderr: #1 /path/to/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array)
mod_fcgid: stderr: #2 /path/to/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
mod_fcgid: stderr: #3 /path/to/wp-includes/general-template.php(2574): do_action('wp_head')
mod_fcgid: stderr: #4 /path/to/wp-content/themes/smartline-lite/header.php(10): wp_head()
mod_fcgid: stderr: #5 /path/to/wp-includes/template.php(684): require_once('/path/to...')
mod_fcgid: stderr: #6 /path/to/wp-includes/template.php(643): load_template('/path/to...', true)
mod_fcgid: stderr: #7 /path/to/wp-includes/general-template.php(45): locate_template(Array, true)
mod_fcgid: stderr: #8 /path/to/wp-co in /path/to/wp-content/plugins/wonderm00ns-simple-facebook-open-graph-tags/public/class-webdados-fb-open-graph-public.php on line 84

Expected Result
Wordpress is able to generate the HTML without issues.

Additional Info
I think this issue is related with WP Total Cache. The plugin might not be compatible to WP Total Cache.