The plugin breaks my site

Hello,
I installed this plugin on my sites when after 2/3 days of use I see that my site is completely broken

https://image.noelshack.com/fichiers/2019/28/2/1562665937-ninja2.png

https://image.noelshack.com/fichiers/2019/28/2/1562665937-ninja1.png

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Why? However when I am connected to the site there I no longer have this display but my site.