Problem of page modification when the plugin is installed

Hello,
I installed the plugin on my website. Since then, when I want to do a modification on pages on my backoffice, I can’t access to the modification mode. Instead, I get a white screen with a black point on the left top of my google chrome window.

I tried to desactivate the plugin and then I can access again to my page. When I reactivate the plugin again, I have the problem coming back.

I did a screen shot if you’d like to have a look. Did anyone get that kind of problem ?
Thanks,
Lucile