MapDB creates errors

Add-ons Persistence Services
3

Thank you for answering :slight_smile:
It seems quite random because it does this with a lot of other items aswell.
This is an other ā€œstandardā€ weather item that givs same error:
DateTime ObservationTime ā€œOppdatert [%1$tH:%1$tM]ā€ {channel=ā€œweatherunderground:weather:cd8316cc:current#observationTimeā€}

This is my mapdb.persist:
Strategies {
default = everyUpdate
}

Items {
// persist all Items on every change and restore them from the MapDB at startup
* : strategy = everyChange, restoreOnStartup
}

l
018-04-11 08:26:02.890 [vent.ItemStateChangedEvent] - ObservationTime changed from 2018-04-11T08:20:59.000+0200 to 2018-04-11T08:25:59.000+0200

==> /var/log/openhab2/openhab.log <==

2018-04-11 08:26:02.935 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener ā€˜org.eclipse.smarthome.core.persistence.internal.PersistenceManagerImpl@a732d0ā€™ about state update of item ObservationTime: 2018-02-16 is not in a valid format.

java.lang.IllegalArgumentException: 2018-02-16 is not in a valid format.

at org.openhab.core.library.types.DateTimeType.<init>(DateTimeType.java:50) [200:org.openhab.core.compat1x:2.2.0]

at org.openhab.core.library.types.DateTimeType.valueOf(DateTimeType.java:64) [200:org.openhab.core.compat1x:2.2.0]