[2.7 only] Locking public chat for a viewer while chat is closed crashes the chat

[Ithanil]

Describe the bug If you lock the public chat for a viewer while it is closed and then reopen the chat, you see it crashed.

To Reproduce Steps to reproduce the behavior:

1. Prepare a meeting with 1 moderator and 1 viewer and the chat closed
2. As the moderator, click on the viewer and "Lock public chat"
3. Observe that the participant list symbol changes position although the chat is not actually opened
4. Open the chat and observe the error

Expected behavior The chat does not crash.

Video Screencast from 2024-11-27 17-47-25.webm

BBB version: BigBlueButton Server 2.7.15 (801)

I can't reproduce the issue on BBB 3.0!

Additional context Browser console:

Error: Minified React error #310; visit https://reactjs.org/docs/error-decoder.html?invariant=310 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
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[17:47:34:0159] ERROR: clientLogger: generic error boundary logger https://bbb-proxy.example.net/bbb-abc-xyz/html5client/9730b53aebb8efa4668c5909b0badc4575816731.js?meteor_js_resource=true:649:716106

[antobinary]

Thanks for reporting!