In the log I can see this warnig :
2024-12-08 09:41:48.715 [WARN ] [e.internal.SseItemStatesEventBuilder] - Attempting to send a state update of an item which doesn't exist: undefined
Is there any chance to trace which item is it ?
This is a warning that almost all the time comes from MainUI. It is completely harmless and can be ignored if you choose.
The warning itself is an indication that in some custom widget you are using a widget expression that should resolve to or include an item name (e.g., items[someVariable + or + expression]) but resolves to undefined instead of a valid item name.
You can narrow down which widget is causing the problem by noting which page view causes the warning to show up and then systematically removing the custom widgets on that page one at a time until the warning does not appear when the page loads.
ok, thank you. Maybe I will try hide witgets step by step via edit YAML and user visibility.