Pressing "I" to inspect your avatar crashes Hubs' 3D viewport

[Exairnous]

Description
Pressing the I key to inspect your avatar crashes Hubs' 3D viewport.

To Reproduce
Steps to reproduce the behavior:

1. Enter a room.
2. Press the I key on your keyboard.
3. See Hubs has frozen and you are no longer able to do anything in the 3D viewport.

Expected behavior
Hubs should show you your avatar in inspect mode without freezing.

Hardware

• Device: Laptop
• OS: Linux
• Browser: Firefox and Chromium

Additional context
This happens with the current (Aframe) loader.
Pressing "F" while hovering over another avatar doesn't trigger this bug.
You can still hear and talk to people, and all the 2D UI buttons like Place and Chat still work.
The error message in the browser console:

Uncaught TypeError: e is undefined
    t camera-system.js:32
    <anonymous> camera-system.js:57
    inspect camera-system.js:277
    tick inspect-yourself-system.js:8
    setupRenderer hubs-systems.ts:241
    setupRenderer app.ts:236
    fl three.module.js:27389
    r three.module.js:12900

This bug was likely introduced in #6067

[Exairnous]

Fixed by #6311