Username history partially broken

Hello,

I encountered an error with the username history lookup on your API.
Since I did not find another place to open a bug record for this, I drop it in here.

Example:

The UUID 5aaf00c1-2bee-4777-969a-c8459c02f607 belongs to the Username Deeper_1653.

When calling the history lookup for this username, the API returns HTTP 204 (no content). I've tried this with different ?at= Parameters.

Please investigate.

Regards