Index: src/bp-groups/bp-groups-admin.php
===================================================================
--- src/bp-groups/bp-groups-admin.php	(revision 12302)
+++ src/bp-groups/bp-groups-admin.php	(working copy)
@@ -861,7 +861,7 @@
  * @param BP_Groups_Group $item The BP_Groups_Group object for the current group.
  */
 function bp_groups_admin_edit_metabox_add_new_members( $item ) {
-	if ( wp_is_large_network( 'users' ) ) {
+	if ( is_multisite() && wp_is_large_network( 'users' ) ) {
 		$class  = '';
 		$notice = __( 'Enter a comma-separated list of user logins.', 'buddypress' );
 	} else {