Interesting Google bug

I entered the search query “sex drugs PHP”, then I switched to the settings page and turned off content filtering and output 100 links per page, clicked “save”, jumped pop-up with a notification about saving, and then there was such an annoying error.

I just have Linux and in the interval between the discoveries of Google, I did not install anything, so I don’t have any viruses. Maybe I was mistaken for a robot?