How do i get past this certificate error?
It would be easier to give you a fish here but since you don't want to share the hostname... the error indicates that the name in the address bar (eg. apple.stackexchange.com) does not match anything in the certificate that the site is presenting (perhaps it actually belongs to some.bogus.example.tld).

I think it's rather a poor idea to defeat the safety measures Google put in there for you. May I ask your reasoning for being fearless here?