Why is Google trying to index a page that doesn't exist?

Question

Google

Hi,
Recently launched a site, and a week later Google cheered me up in Webmaster Tools that index.php could not be found. I didn't find any links on my site to index.php, and in general I use Python + Django. I checked all the libraries that I use, there is nothing like that either. Why did Google decide that I should have this file?
And the main question is how best to fix this error? I have a decision to do the following. In Nginx, configure that when this file is accessed, there will be a 301 redirect to the main page and mark in the control panel that the error has been fixed.
Has anyone experienced something similar? How to proceed?
Thank you.

Answer 1

If an external link is somewhere, then the bot can still break into this page.
Maybe the page was before and there was a link, then they removed it, but the page is still "in the index".
There is an option that you didn’t search well and the link is still somewhere, maybe in the sitemap Google usually gives out the place where the link to the page is from, you can add it to the Yandex webmaster for interest.
It is necessary to configure everything so that when accessing ANY address (and directories), in addition to existing pages, the site would return the correct 404 page and pass it in the header, incl. code 404