Edit button from speaker profile goes to 404 page

I saw the "Edit" button on my own speaker page (https://us.pycon.org/2019/speaker/edit/9/).
When I clicked on the button, I got a 404.

However, the edit speaker page: https://us.pycon.org/2019/speaker/edit/ (without the 9 at the end) works for me.

It would be great if someone could look into this. Thanks.