accept-encoding: gzip header

Hi,
I’ ve tested my site with nibbler (https://nibbler.silktide.com/) and there is one error about gzip; I’m using WP Speed of Light of course.

Error:
This website returns GZIP encoded content even if the client does not support compression. GZIP compression is good because it is widely supported and reduces the load time of a web page. However, some devices and web crawlers might not support GZIP compression so your website should obey the accept-encoding HTTP header.

Recommendation:
Ensure GZIP compressed content is only returned when the client sends the accept-encoding: gzip header.

So, what should be done?

Thank you in advance!