[SOGo] error messages from expire-sessions since upgrade to v2.3.12 (was: ANN: SOGo v2.3.12)

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Since I upgraded to 2.3.12, I get
<0x0x1491800[SOGoProductLoader]> Mailer.SOGo, SchedulerUI.SOGo, CommonUI.SOGo, ContactsUI.SOGo, AdministrationUI.SOGo, ActiveSync.SOGo, PreferencesUI.SOGo, Contacts.SOGo, MainUI.SOGo, Appointments.SOGo, MailerUI.SOGo, MailPartViewers.SOGo
[so-category-info] did not find exported SoClass 'SOGo' in product <0x0x167d250[SoProduct]: loaded code-loaded bundle=/usr/lib/GNUstep/SOGo/MainUI.SOGo #classes=8 #categories=4 rm=0x0x16813f0>!
as output of "/usr/sbin/sogo-tool expire-sessions 60" from the cron
scripts (every minute!).
What can be the cause of this? I did not change anything to the config,
just ran a "apt-get dist-upgrade" on my debian jessie system.

Same here.