How to prevent fonts.gstatic.com/stats URLs from throwing console errors?

When including the Oswald font on our site and serving it via https, Console spits out the warning
"Failed to decode downloaded font: https://fonts.gstatic.com/stats/Oswald/normal/400"

Code added to style.css
@import url('https://fonts.googleapis.com/css?family=Oswald:400,700'); or
@import url('//fonts.googleapis.com/css?family=Oswald:400,700');
calls
https://fonts.gstatic.com/stats/Oswald/normal/400
and then outputs the warning
Failed to decode downloaded font: https://fonts.gstatic.com/stats/Oswald/normal/400
in chrome devtools > console.

It does not warn about 700 weight, for some reason. When serving our site via http the warning is gone.