BuddyPress.org

I just updated from trunk 1281 to 1287. Everything works fine so far, except on every page but the homepage I get an error in the admin bar:

Warning: ksort() expects parameter 1 to be array, null given in /home/wearesau/public_html/wp-content/mu-plugins/bp-core.php on line 1189

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/wearesau/public_html/wp-content/mu-plugins/bp-core.php on line 1192

On wearesau.net it works, but on wearesau.net/blog and all similar URLs it errors. It also errors on blog.wearesau.net.