Homepage error message

Hi,

My homepage is getting the following warning at the top, which I assume is related to Opengraph.

I have deleted and reinstalled the plugin, but it results in the same error.

Does anyone have any suggested solutions?

Thanks!

`
Warning: get_class() expects parameter 1 to be object, null given in /homepages/19/d781759244/htdocs/wp-content/plugins/wonderm00ns-simple-facebook-open-graph-tags/public/class-webdados-fb-open-graph-public.php on line 953

The page I need help with: [log in to see the link]