open graph error with facebook share

Hi,

the first time I want to share a post via facebook the fb-popup shows an open graph error saying that “article” is not valid cause it defines 2 “og:url” values. And then it shows the url of the post twice. When I try it a second time there is no error message anymore and it works just fine.

Whats the issue there? I don’t want taht the visitors of my page get that error. I have other social buttons installed and there is no such error when I share.

Here is a link: http://siehdiewelt.com/die-opium-bauern-vom-sinai/
(I deactivated fb-sharing in social locker cause of this error)

Thanks
Markus

https://ww.wp.xz.cn/plugins/social-locker/