API: 'Key Results' calls have a "Nullable object must have a value" error

Issue Summary

API to return all 'Key Results' is having an Error 500: "Nullable object must have a value"

Steps to Reproduce

1. Got an API token and do the authorization settings before making an API call
2. Call https://<your-ja-instance-name>.jiraalign.com/rest/align/api/2/KeyResults

Expected Results

List of Key Results

Actual Results

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.6.1",
    "title": "An error occured while processing your request.",
    "status": 500,
    "traceId": "|e1f21fe6-4ad01e4c3eXxXxXx."
}

Exception: System.InvalidOperationException: Nullable object must have a value.

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available