Believe i have been able to pinpoint to the trigger point for the problem
Attached Snapshot.
Below URL fails
500 error
cache-control: no-cache, no-store, max-age=0, must-revalidate
connection: close
content-language: en
content-type: application/hal+json;charset=UTF-8
date: Sat, 25 Sep 2021 08:01:18 GMT
expires: 0
pragma: no-cache
transfer-encoding: chunked
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers, Origin, Access-Control-Request-Method, Access-Control-Request-Headers, Origin, Access-Control-Request-Method, Access-Control-Request-Headers
x-content-type-options: nosniff
x-frame-options: DENY
x-xss-protection: 1; mode=block
{
"timestamp": "2021-09-25T08:01:18.958+00:00",
"status": 500,
"error": "Internal Server Error",
"message": "An exception has occurred",
"path": "/server/api/core/sites"
}