Chat DM throwing back-end exception appearing on client as Not Found

Hey guys, I believe I’m getting an intermittent issue on Chat since updating this weekend:

This happens sometimes when entering a DM, e.g. by hitting the Chat button on a Users Card:

`PUT 404 (Not Found)

f @ ajax.js:173`

I did a little investigation and I believe the back end is throwing this:

1 Like

FYI I can reproduce on Meta:


1 Like

STR reliably:

  • Using anyone’s User Card, hit “Chat”
  • Send them a message
  • Close the Chat Window completely
  • Hit the Chat icon and open the same DM
  • Exception shows in Browser.

Observation: a browser refresh initially prevents the exception.