TypeError: Cannot read properties of null (reading 'get')

[brainstorm]

Describe the bug

When re-starting homebridge, occasionally the following fatal error appears, making automatic homebridge-camera-ui auto-respawn harder to automate:

(...)
[7/31/2022, 6:06:59 PM] TypeError: Cannot read properties of null (reading 'get')
    at file:///data/data/com.termux/files/usr/lib/node_modules/homebridge-camera-ui/src/accessories/camera.js:280:57
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
[7/31/2022, 6:06:59 PM] TypeError: Cannot read properties of null (reading 'get')
    at file:///data/data/com.termux/files/usr/lib/node_modules/homebridge-camera-ui/src/accessories/camera.js:280:57
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
[7/31/2022, 6:06:59 PM] TypeError: Cannot read properties of null (reading 'get')
    at file:///data/data/com.termux/files/usr/lib/node_modules/homebridge-camera-ui/src/accessories/camera.js:280:57
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
[7/31/2022, 6:06:59 PM] Got SIGTERM, shutting down Homebridge...
[7/31/2022, 6:07:04 PM] [CameraUI] Galaxy S4 Camera: Setting up camera, please be patient...
[7/31/2022, 6:07:04 PM] [CameraUI] Nexus 4 Camera: Setting up camera, please be patient...
[7/31/2022, 6:07:04 PM] [CameraUI] Homebridge Nexus 4 Camera: Setting up camera, please be patient...
[Nexus 4 Camera E819] The image snapshot handler for the given accessory is slow to respond! See https://homebridge.io/w/JtMGR for more info.
[Homebridge Nexus 4 Camera 2B23] The image snapshot handler for the given accessory is slow to respond! See https://homebridge.io/w/JtMGR for more info.
[Galaxy S4 Camera 3FF7] The image snapshot handler for the given accessory is slow to respond! See https://homebridge.io/w/JtMGR for more info.

To Reproduce

Install LineageOS on a Nexus 4, install termux, nodejs, and npm install homebridge-camera-ui. Add three cameras and perhaps the error above manifests.

Expected behavior

I would expect that homebridge-camera-ui has a consistent state on each (re)start/stop of the service. Or at least that queues are either flushed/discarded upon start to or that .get(s) know how to deal with null or corrupted objects in the queue(s) without shutting down homebridge.

At first I thought that just removing the empty cachedAccessories solved the problem:

~ $ cat ~/.homebridge/accessories/cachedAccessories
[]
~ $ rm ~/.homebridge/accessories/cachedAccessories
~ $ homebridge -D
(...)

But the problem seems to be elsewhere, perhaps some corrupted database entry or queue object?

Environment

• Node.js Version: v18.4.0
• Homebridge Version: v1.5.0
• Camera UI Version:

  $ npm list -g
/data/data/com.termux/files/usr/lib
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]

• Operating System: Linux localhost 3.4.113-lineageos-ge3e5c40db2e SMP PREEMPT Fri Jun 17 03:59:18 MSK 2022 armv7l Android

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[romeolazar]

I have this issue. how can I fix this? without reinstalling it from scratch!

[Olivierbkk]

same here, any fix?

[LemminatorGer]

Hi
i have the same issue:
Is there an fix anywehere ?
TypeError: Cannot read properties of null (reading 'get') at file:///var/lib/homebridge/node_modules/homebridge-camera-ui/src/accessories/camera.js:280:57 at processTicksAndRejections (node:internal/process/task_queues:95:5)

[brainstorm]

#896 (comment) seems like a reasonable patch, have you tried it?

[Olivierbkk]

yes I tried and it seems to work, so far so good