From 5185a3c0c957bc01f159118a32a0a4aaf1f23532 Mon Sep 17 00:00:00 2001
From: Robin Appelman <robin@icewind.nl>
Date: Thu, 13 Jul 2017 14:33:46 +0200
Subject: [PATCH] null users dont exist

Signed-off-by: Robin Appelman <robin@icewind.nl>
---
 lib/private/User/Manager.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index c04f426c2c..ded807a223 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -126,6 +126,9 @@ class Manager extends PublicEmitter implements IUserManager {
 	 * @return \OC\User\User|null Either the user or null if the specified user does not exist
 	 */
 	public function get($uid) {
+		if (is_null($uid) || $uid === '' || $uid === false) {
+			return null;
+		}
 		if (isset($this->cachedUsers[$uid])) { //check the cache first to prevent having to loop over the backends
 			return $this->cachedUsers[$uid];
 		}