Could you provide the debug log of this issue? It shouldn't happen in the first place.

@Koenkk, it looks exactly like the one in the issue attached or do you ask for a different log?

[2024-10-04 14:54:07] error: 	z2m: Failed to call 'HomeAssistant' 'start' (TypeError: Cannot read properties of undefined (reading 'deviceIeeeAddress')
    at HomeAssistant.getBridgeEntity (/app/lib/extension/homeassistant.ts:2016:78)
    at HomeAssistant.start (/app/lib/extension/homeassistant.ts:476:28)
    at Controller.callExtensions (/app/lib/controller.ts:399:17)
    at Controller.start (/app/lib/controller.ts:218:9)
    at start (/app/index.js:154:5))
[2024-10-04 14:54:07] info: 	z2m: Zigbee2MQTT started!

In my case I was re-installing the add-on because of testing between ZHA and Zigbee2mqtt.
After I solved the issues with the dongle firmware, I started to see the error above.
Removing the remainders of configs and re-installing the add-on instantly solved it. Same as for a few people in this issue: Koenkk/zigbee2mqtt#24317

If I had more time, I'd debug for a PR to fix it. I'm relatively new to the HA ad-ons.
Although outdated and not cleaned up configuration with dangling IDs or bogus Entities has already affected me in HA.

If you don't want it in the plugin's manual I can create smth like a troubleshooting or known-issue doc. I mean, if you dig for some time you might find the issue, but with so much noise being around it wasted me quite a bit of time.
Before this is properly fixed, such docs would make my day.

Thanks for investing into this awesome project by the way!

Before adding this, let's first analyse a bit what the problem is. I will need the debug logging + database.db file of when this happens.

See this on how to enable debug logging.

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