don't process empty or non-existent group array

diff --git a/mod/group.php b/mod/group.php
index 01875d01f6cc20db8e8ecf0ba3c15eecadc3147a..fcdc6a75823b682516595b78d4f3056c1300ab92 100644 (file)
--- a/mod/group.php
+++ b/mod/group.php
@@ -56,13 +56,14 @@ function group_post(&$a) {
                                notice( t('Group name changed.') . EOL );
                }
                $members = $_POST['group_members_select'];
-               array_walk($members,'validate_members');
+               if(is_array($members))
+                       array_walk($members,'validate_members');
                $r = q("DELETE FROM `group_member` WHERE `gid` = %d AND `uid` = %d",
                        intval($a->argv[1]),
                        intval(local_user())
                );
                $result = true;
-               if(count($members)) {
+               if(is_array($members) && count($members)) {
                        foreach($members as $member) {
                                $r = q("INSERT INTO `group_member` ( `uid`, `gid`, `contact-id`)
                                        VALUES ( %d, %d, %d )",