Index: bp-themes/bp-default/functions.php
===================================================================
--- bp-themes/bp-default/functions.php	(revision 4163)
+++ bp-themes/bp-default/functions.php	(working copy)
@@ -27,6 +27,9 @@
  * @since 1.2
  */
 
+if ( ! function_exists( 'bp_is_active' ) )
+	return true;
+
 // If BuddyPress is not activated, switch back to the default WP theme
 if ( !defined( 'BP_VERSION' ) )
 	switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );