Facing Uncaught server error: java.lang.NullPointerException on addMasterRealmAccess when accessing RHSSO 7 Administration Console

Issue

• Uncaught server error: java.lang.NullPointerException:

:14:22:20,512 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-22) Uncaught server error: java.lang.NullPointerException
    at org.keycloak.services.resources.admin.AdminConsole.addMasterRealmAccess(AdminConsole.java:246)
    at org.keycloak.services.resources.admin.AdminConsole.whoAmI(AdminConsole.java:219)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138)