Index: bp-core/bp-core-classes.php
===================================================================
--- bp-core/bp-core-classes.php	(revision 7232)
+++ bp-core/bp-core-classes.php	(working copy)
@@ -315,7 +315,7 @@
 		/** WHERE *************************************************************/
 
 		// 'include' - User ids to include in the results
-		$include     = ! empty( $include ) ? wp_parse_id_list( $include ) : array();
+		$include     =  ( false !== $include ) ? wp_parse_id_list( $include ) : array();
 		$include_ids = $this->get_include_ids( $include );
 		if ( ! empty( $include_ids ) ) {
 			$include_ids    = implode( ',', wp_parse_id_list( $include_ids ) );