Error with https://dani.builds.terrible.systems/

exception = HTTPSConnectionPool(host='dani.builds.terrible.systems', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'dani.builds.terrible.systems'. (_ssl.c:992)")))