From 62fff9480826f8e5dc9d79a98c9f13e4bd780ea4 Mon Sep 17 00:00:00 2001
From: Johannes Meyer <johannes.meyer@netways.de>
Date: Mon, 1 Jun 2015 15:16:03 +0200
Subject: [PATCH] DbUserGroupBackend: Do not try to fetch a group id for null

refs #8826
---
 .../Icinga/Authentication/UserGroup/DbUserGroupBackend.php    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
index e77d50f78..fd1228065 100644
--- a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
@@ -208,8 +208,8 @@ class DbUserGroupBackend extends DbRepository implements UserGroupBackendInterfa
      */
     protected function persistGroupId($groupName)
     {
-        if (is_int($groupName)) {
-            return $groupName; // It's obviously already an id
+        if (! $groupName || is_int($groupName)) {
+            return $groupName; // It's obviously already an id or NULL
         }
 
         $groupId = $this->ds