Recently active topics in Wuala tagged with invite

Absolutely nothing happens when I click the "Get more by Invite friends to Wuala" link in the bottom right-hand corner of the app. I haven't used any invites yet.

today i sent invites out with skype, but as the skype windows opened there was only the message "null" sent - maybe the update wuala installed today did nothing good to skype inviting...
however i could recover the invites under the friends page by opening an invited friend, read the message that should have been sent and resend them manually.
but still it's much more comfortable to let wuala do the work ;)

Email addresses could not bei imported
Cause: java.lang.AssertionError