Unable to download Organization debug certificate from Satellite 6.1, it fails with "500 Internal Server Error "

Issue

• Downloading debug certificate fails with error as below,

{
  "error": {"message":"Katello::Resources::Candlepin::Owner: 500 Internal Server Error {\"displayMessage\":\"Runtime Error Index: 0, Size: 0 at java.util.ArrayList.rangeCheck:635\",\"requestUuid\":\"89db329f-f800-4cf0-bc4b-edc654a63a65\"} (GET /candlepin/owners/organization-label/uebercert)"}
}