After registering Satellite Server 5.6 or 5.7 to RHSM using activation key, satellite certificate activation fails with error : Fault -2: "unhandled internal exception: Null values aren't supported, if isEnabledForExtensions() == false"

Issue

• After registering Satellite Server 5.6 or 5.7 to RHSM using activation key, satellite certificate activation fails with below error

# rhn-satellite-activate -vvv --rhn-cert=RH_Satellite_cert.xml
RHN_PARENT: satellite.rhn.redhat.com
HTTP_PROXY: None
HTTP_PROXY_USERNAME: None
HTTP_PROXY_PASSWORD: <password>
CA_CERT: /usr/share/rhn/RHNS-CA-CERT
Checking cert XML sanity and GPG signature: '/usr/bin/validate-sat-cert.pl --keyring /etc/webapp-keyring.gpg /etc/sysconfig/rhn/rhn-entitlement-cert.xml-0jj6G3'
Database connectioned initialized: refer to /etc/rhn/rhn.conf
Attempting local RHN Certificate push (and therefore activation)
Executing: remote XMLRPC activation call.
Error reported from RHN: <Fault -2: "unhandled internal exception: Null values aren't supported, if isEnabledForExtensions() == false">
ERROR: unhandled XMLRPC fault upon remote activation: <Fault -2: "unhandled internal exception: Null values aren't supported, if isEnabledForExtensions() == false">