From 8f4611e21d334ea3135bbdbf9519236bb4b6b173 Mon Sep 17 00:00:00 2001
From: Lukas Reschke <lukas@owncloud.com>
Date: Fri, 2 Oct 2015 21:56:20 +0200
Subject: [PATCH] Check if decoded JSON returned null

The value might return null resulting in a PHP error.

Fixes https://github.com/owncloud/core/issues/19542
---
 settings/admin.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/settings/admin.php b/settings/admin.php
index ec49b3e823f..aa891314fab 100644
--- a/settings/admin.php
+++ b/settings/admin.php
@@ -88,7 +88,7 @@ $excludeGroups = $appConfig->getValue('core', 'shareapi_exclude_groups', 'no') =
 $template->assign('shareExcludeGroups', $excludeGroups);
 $excludedGroupsList = $appConfig->getValue('core', 'shareapi_exclude_groups_list', '');
 $excludedGroupsList = json_decode($excludedGroupsList);
-$template->assign('shareExcludedGroupsList', implode('|', $excludedGroupsList));
+$template->assign('shareExcludedGroupsList', !is_null($excludedGroupsList) ? implode('|', $excludedGroupsList) : '');
 $template->assign('encryptionEnabled', \OC::$server->getEncryptionManager()->isEnabled());
 $backends = \OC::$server->getUserManager()->getBackends();
 $externalBackends = (count($backends) > 1) ? true : false;