While importing manifest on the Satellite v6 server, it failed with error "500 Internal Server Error"

Issue

• While importing manifest on the Satellite v6 server, it failed with error "500 Internal Server Error".  In the /var/log/foreman/production.log file, we can see the below error:

Error during manifest import: {"displayMessage"=>"Runtime Error query did not return a unique result: 2 at org.hibernate.internal.AbstractQueryImpl.uniqueElement:918", "requestUuid"=>"90495cab-edf9-4cc3-949b-5b3ad19e746b"}