distributed authentication reports warnings for the first login

I am trying to setup a site with distributed authentication from other site. The first time logging in give me below warning. Anyway, I could log in successfully.

    * warning: array_keys() [function.array-keys]: The first argument should be an array in /home/codenone/public_html/modules/user/user.module on line 359.
    * warning: implode() [function.implode]: Bad arguments. in /home/codenone/public_html/modules/user/user.module on line 359.
    * user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 query: SELECT DISTINCT(p.perm) FROM role r INNER JOIN permission p ON p.rid = r.rid WHERE r.rid IN () in /home/codenone/public_html/includes/database.mysql.inc on line 167.

After some investication, $account used in user_access() is now 'false'. Probably the problem is in user_authenticate() while global $user is specified on the top of this function.

        $user = user_load(array('name' => $name));
        if (!$_user->uid) { // Register this new user.
          $userinfo = array('name' => $name, 'pass' => user_password(), 'init' => $name, 'status' => 1);
          if ($server) {
            $userinfo["authname_$module"] = $name;
          }
          $user = user_save('', $userinfo);
          watchdog('user', t('New external user: %user using module %module.', array('%user' => $name, '%module' => $module)), WATCHDOG_NOTICE, l(t('edit'), 'user/'. $user->uid .'/edit'));
          break;
        }

user_load() will return 'false' and it still remains as 'false' until user_save() return the correct one. During that period, user_access() is called with 'administer users'. Now I solve this problem in my site by below patch.

--- user.module.orig    2007-01-08 08:33:44.102988756 +0700
+++ user.module 2007-01-08 08:42:31.704088306 +0700
@@ -989,7 +989,7 @@
         if ($server) {
           $name .= '@'. $server;
         }
-        $user = user_load(array('name' => $name));
+        $_user = user_load(array('name' => $name));
         if (!$_user->uid) { // Register this new user.
           $userinfo = array('name' => $name, 'pass' => user_password(), 'init' => $name, 'status' => 1);
           if ($server) {
@@ -999,6 +999,9 @@
           watchdog('user', t('New external user: %user using module %module.', array('%user' => $name, '%module' => $module)), WATCHDOG_NOTICE, l(t('edit'), 'user/'. $user->uid .'/edit'));
           break;
         }
+        else {
+          $user = $_user;
+        }
       }
     }
   }