From b464cfa27702e2db6cbf8542c5c7019b2d2366e4 Mon Sep 17 00:00:00 2001
From: Mark Friedrich <exodus4d@users.noreply.github.com>
Date: Tue, 7 May 2019 00:15:12 +0200
Subject: [PATCH] - fixed PHP Notice for invalid array key access

---
 app/Main/MapUpdate.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/app/Main/MapUpdate.php b/app/Main/MapUpdate.php
index f950c01..6c9f3c8 100644
--- a/app/Main/MapUpdate.php
+++ b/app/Main/MapUpdate.php
@@ -360,7 +360,14 @@ class MapUpdate implements MessageComponentInterface {
      * @return array
      */
     private function getCharacterIdsByMapId(int $mapId) : array {
-        return is_array($this->subscriptions[$mapId]) ? array_keys($this->subscriptions[$mapId]) : [];
+        $characterIds = [];
+        if(
+            array_key_exists($mapId, $this->subscriptions) &&
+            is_array($this->subscriptions[$mapId])
+        ){
+            $characterIds = array_keys($this->subscriptions[$mapId]);
+        }
+        return $characterIds;
     }
 
     /**