Hi Tima,
I am not able to replicate this locally. Can you provide us your backend and ftp access at http://stackideas.com/dashboard/site so we can investigate this on your site? Thanks.

I have added the accesses in the post, but when you edit it apparently deleted .. I added the accesses on your link;)

Hi Tima,
I am able to replicate this locally. It seems the issue arises when the 'Followers' menu item is created.
I have log this issue in our tracker so the devs can investigate this.