"Page 'http://127.0.0.1:63342...' requested without authorization." pop-up doesn't go away and ends up in 404.

After the latest update, these pop-ups started appearing in PyCharm:

I have no idea what this means; but when I click on the button and paste the URL (http://127.0.0.1:63342/api/toolbox/restart-notification?_ijt=somerandomstring) into my browser, I only ever get a "404 Not Found" error. The port is apparently open by the PyCharm instance.

It appears every 20 minutes or so, and is rather annoying. What could this be caused by, and how to fix it?

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