invalid code loads infinitely

I tried to add a variable, and accidently used = instead of :
I noticed this invalid sass code caused issues. Only if I load the site from a browser, the browser loads forever, and an error continues to post every few seconds. the error says: Invalid status code: 1.
when running on localhost, my windows computer also does an error beep. This is not a normal sound for my IDE (webstorm). I figured I should mention this so it can be fixed.