PHP warning about

I've just upgraded to BP 1.1.1 using the new version of the Corporate theme and am seeing lots of these errors for the first time.

PHP Warning: Missing argument 2 for bp_get_the_body_class() in /blah/path/wp-content/plugins/buddypress/bp-core/bp-core-templatetags.php on line 1593

Can anyone suggest a fix? Is it the theme or BuddyPress which is the problem?