0.0.0.0 answer for geonovum.github.io

I can't access https://geonovum.github.io/ and it seems to be caused by a incorrect lookup result from nextdns:

nslookup geonovum.github.io
Server: dns1.nextdns.io
Address:  45.90.28.138

Non-authoritative answer:
Name: geonovum.github.io
Addresses:  ::
          0.0.0.0
 

I've tried "ipconfig /flushdns", but doesn't change the DNS response.

For github.io de answer is ok:

nslookup github.io
Server: dns1.nextdns.io
Address:  45.90.28.138

Non-authoritative answer:
Name: github.io
Addresses:  185.199.108.153
          185.199.110.153
          185.199.109.153
          185.199.111.153

A lookup via another DNS for geonovum.github.io gives a good response:

nslookup geonovum.github.io
Server:         213.133.99.99
Address:        213.133.99.99#53

Non-authoritative answer:
Name: geonovum.github.io
Address: 185.199.110.153
Name: geonovum.github.io
Address: 185.199.111.153
Name: geonovum.github.io
Address: 185.199.108.153
Name: geonovum.github.io
Address: 185.199.109.153
Name: geonovum.github.io
Address: 2606:50c0:8002::153
Name: geonovum.github.io
Address: 2606:50c0:8003::153
Name: geonovum.github.io
Address: 2606:50c0:8000::153
Name: geonovum.github.io
Address: 2606:50c0:8001::153