[Bug]: can't enable "last seen" in Zigbee2mqtt.

[robknapton]

What happened?

When I go into Zigbee2MQTT settings and try to enable the "last seen" toggle, it throws an error. It doesn't matter which type I use to enable. It does not matter what browser I use either.

initialState.json.zip

File and screenshot attached.

What browsers are you seeing the problem on?

Chrome

Relevant stacktrace

**Current url**: http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/#/settings/settings
**Previous url**: http://homeassistant:8123/zigbee2mqtt2


**Error type**: TypeError
**Error message**: Cannot convert undefined or null to object



TypeError: Cannot convert undefined or null to object
    at Object.entries (<anonymous>)
    at r (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:53:9630)
    at r (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:53:9692)
    at lUe (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:53:9732)
    at Se.onSettingsSave [as onSubmit] (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-b5a4d188.js:1:8583)
    at e.<anonymous> (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/bootstrap-5.esm-b480a4c5.js:11:47737)
    at lD (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:41:9885)
    at SD (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:43:31876)
    at K5 (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:43:31458)
    at K5 (http://homeassistant:8123/api/hassio_ingress/0l4O3JxSkQt8T7xWqziHjmvw87gsjuEsm33FjicWfMA/assets/index-4e00f6e9.js:43:31368)

Did you download state.json.zip?

I will attach state.json.zip

[antworks-hub]

Same thing happens to me while trying to enable "last seen". Chrome Browser, HAOS 2025.8.3 (16.1), Z2M 2.6.0

initialState.json.zip

[tudorsmt]

Same here. Exact same setup, using a Conbee II dongle. Attaching zip. It doesn't even matter if I change any value. Just pressing save in the "Advanced" tab gets me here.

initialState.json.zip

[stale[bot]]

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.