It will returns 500, if the main entity is not find.

[stanislavt]

If I try to call GET /resource - it works clear, but if I try to call GET /resource/{id} with the mixin, I will get the error:

{
  "error": {
    "statusCode": 500,
    "message": "Internal Server Error"
  }
}

I think you should change the behavior of this case.

Hope it is clear for you. If you have questions, don't hesitate, ask me.