From 657e5a7cedd26aa4513c50f952cf64b7904040fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcin=20=C5=81ojewski?= <marcin.lojewski@mlojewski.me>
Date: Sat, 30 Jun 2018 23:35:16 +0200
Subject: [PATCH] Handle null value for isAdmin function

---
 lib/Backend/GroupBackend.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Backend/GroupBackend.php b/lib/Backend/GroupBackend.php
index c44d359..6174b26 100644
--- a/lib/Backend/GroupBackend.php
+++ b/lib/Backend/GroupBackend.php
@@ -358,13 +358,13 @@ final class GroupBackend extends ABackend implements
     /**
      * @inheritdoc
      */
-    public function isAdmin(string $uid): bool
+    public function isAdmin(string $uid = null): bool
     {
         $this->logger->debug(
             "Entering isAdmin($uid)", ["app" => $this->appName]
         );
 
-        if (empty($this->properties[DB::GROUP_ADMIN_COLUMN])) {
+        if (empty($this->properties[DB::GROUP_ADMIN_COLUMN]) || $uid === null) {
             return false;
         }