Group items undeftype in logs

I have the jdbc mariadb persistence running and the “lazy” strategy:

Strategies {
    everyHour : "0 0 * * * ?"
    everyDay  : "0 0 0 * * ?"

    default = everyChange
}
Items {
    * : strategy = everyChange,everyUpdate,restoreOnStartup
}

Now I have many of this entrys in the logfiles:

2016-12-28 00:01:06.378 [WARN ] [jdbc.internal.JdbcPersistenceService] - JDBC::store: ignore Item 'All' because it is UnDefType
2016-12-28 00:01:06.378 [WARN ] [jdbc.internal.JdbcPersistenceService] - JDBC::store: ignore Item 'OG' because it is UnDefType

So they seem to be related to this items:

Group	All
Group	OG	(All)	

Is this expected behaviour, should this messages only appear on startup or not at all?
This messages doesn’t appear on every Group-item, on many items they appear once on startup.

Hi there, i have these logs also … did you get any feedback outside of this thread, or did you figure it out yourself ?

No, they are still there.
I wanted to try if another database makes a difference but had no time.
Do you also use mysql/mariadb or something other?

it´s jdbc -> mariadb