# Group state not updating, reboot solves it **URL:** \ **Category:** Items & Sitemaps\ **Created:** [December 17, 2017, 9:31am UTC](https://community.openhab.org/t/group-state-not-updating-reboot-solves-it/37372 "2017-12-17T09:31:07Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![mstormi](https://community.openhab.org/user_avatar/community.openhab.org/mstormi/32/55857_2.png) [@mstormi](https://community.openhab.org/u/mstormi)\ **Post date:** [December 17, 2017, 3:17pm UTC](https://community.openhab.org/t/group-state-not-updating-reboot-solves-it/37372/4 "2017-12-17T15:17:11Z")
> [@teaserr](#): > > Is this the correct analysis? No, [this](https://docs.openhab.org/configuration/items.html#group-type) says that if _no_ member is ON (i.e. if they’re all _either_ OFF _or_ NULL), OFF is returned. > [@teaserr](#): > > If yes, shouldn’t it be better to ignore NULL states? I wouldn’t use the OR(…) logic anyway as in terms of presence detection, you should be aware that sensors can produce false positives, so I’d suggest to check for a _quorum_ such as 2 (means: have at least _2_ sensors ON before you consider this to be a a signof presence). To get there, you cannot use built-in functions anyway but need to program your own (i.e. a [lambda](https://community.openhab.org/t/reusable-functions-a-simple-lambda-example-with-copious-notes/15888)). --- _[View the full topic](https://community.openhab.org/t/group-state-not-updating-reboot-solves-it/37372)._