From 5c7792336052702ccbbfb920ef5a8606d1ba695b Mon Sep 17 00:00:00 2001
From: Loki3000 <github@labcms.ru>
Date: Tue, 10 Jan 2017 16:39:10 +0300
Subject: [PATCH] allowed '0' uid

---
 lib/private/User/Database.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/private/User/Database.php b/lib/private/User/Database.php
index dccdb790145..73c918e9944 100644
--- a/lib/private/User/Database.php
+++ b/lib/private/User/Database.php
@@ -239,7 +239,7 @@ class Database extends Backend implements IUserBackend {
 	private function loadUser($uid) {
 		if (!isset($this->cache[$uid])) {
 			//guests $uid could be NULL or ''
-			if (empty($uid)) {
+			if ($uid===null || $uid==='') {
 				$this->cache[$uid]=false;
 				return true;
 			}