BuddyPress.org

The groupblog_blog_id should hold a single value. If this isn’t the case it is misfiring somewhere. Did the following post help at all? Please follow the instructions there and see if you can clean up the meta table. This should not be a problem in 1.4.4, but 1.4.3 causes issues.

https://wordpress.org/support/topic/371370?replies=6#post-1427856