On file /www/server/panel/class/panelDnsapi.py
at line 204 I replaced
from
url = urljoin(self.CLOUDFLARE_API_BASE_URL, "zones?status=active")
to
url = urljoin(self.CLOUDFLARE_API_BASE_URL, "zones?status=active&name={0}".format(domain_name))
and works perfectly