FE messag: Error Embedding

Edward Lenssen reported an issue

See url. Just above footer message Error Embedding shows up.

Thanks for all your great work.

Reported URL:https://typo3.org/article/typo3camp-venlo-2018-for-a-lot-of-inspiration/

User Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36