SessionEndedRequest Null Reference exception

[hvetter-de]

In class RequestEnvelope the following code throws an exception:

case "SessionEndedRequest":

                    SessionEndedRequest.ReasonEnum reason;

                    Enum.TryParse<SessionEndedRequest.ReasonEnum>(requestJson.Value<string>("reason"), out reason);

                    request = new SessionEndedRequest(requestId, timestamp, locale, reason,Error.FromJObject(requestJson.Value<JObject>("error")));

                    break;

This is because requestJson.Value<JObject>("error") "error" doesn't exists in JSON