RoomDirectory->MessagePanel: Uncaught TypeError: can't access property Symbol.iterator, e[n].instances is undefined

[jaller94]

Description

I have a new localhost Synapse using the Docker image.
Changes I have made to the config:

• Added my IRC bridge (which wasn't pumbing yet but the appservice bot was already connected)
• Enabled registration

Steps to reproduce

• Have an appservice that's not ready yet. (see Synapse's network responses in the mp4 below)
• Open "Explore rooms"
• Choose "All rooms"

Describe how what happens differs from what you expected.

The dialog closes with a JavaScript error.

Uncaught TypeError: can't access property Symbol.iterator, e[n].instances is undefined
    Bl MessagePanel.js:836
    render RoomDirectory.js:391
    React 7
    unstable_runWithPriority scheduler.production.min.js:13

Logs being sent: yes

Peek.2021-03-25.20-45.mp4

Version information

• Platform: web

For the web app:

• Browser: Firefox Dev 87.0b9
• OS: Arch Linux btw.
• URL: 1.7.23 stable from the Github tar.gz on localhost via python -m http.server

[t3chguy]

This is an issue with a spec violation on the server side, instances is a required array field.

https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-thirdparty-protocols

[jaller94]

My server is matrixdotorg/synapse:latest which currently resolves to
https://registry.hub.docker.com/layers/matrixdotorg/synapse/latest/images/sha256-67a507a29e0406a0e93a9040617380f7310f625e86adb5652ef24cd1ce39db48?context=explore

[t3chguy]

I suggest opening a Synapse issue in that case

[t3chguy]

Closing in favour of the synapse spec compliance issue