Apparently correct link marked as failed

[JJ]

This is the error I get:

  [✖] https://opendata.ugr.es/dataset/ → Status: 0 Error: unable to verify the first certificate
    at TLSSocket.onConnectSecure (node:_tls_wrap:1676:34)
    at TLSSocket.emit (node:events:520:28)
    at TLSSocket._finishInit (node:_tls_wrap:1087:8)
    at ssl.onhandshakedone (node:_tls_wrap:873:12) {
  code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE'
}

That URL is apparently correct and verified by Firefox, and can of course be downloaded. I don't see any way this error can be configured to be ignored, either.