From e67037744edbb115b88b23f3ab6926f77244ca9f Mon Sep 17 00:00:00 2001
From: Robert Kaiser <kairo@kairo.at>
Date: Wed, 29 Dec 2021 23:26:17 +0100
Subject: [PATCH] make sure the array key exists

---
 classes/rrdstat.php-class | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/classes/rrdstat.php-class b/classes/rrdstat.php-class
index 1ed4504..9743e7a 100644
--- a/classes/rrdstat.php-class
+++ b/classes/rrdstat.php-class
@@ -496,7 +496,7 @@ class rrdstat {
 
     // assemble configuration
     $gconf = (array)$extra;
-    if (!is_null($sub) && is_array($this->config_raw['graph.'.$sub])) {
+    if (!is_null($sub) && array_key_exists('graph.'.$sub, $this->config_raw) && is_array($this->config_raw['graph.'.$sub])) {
       $gconf = $gconf + $this->config_raw['graph.'.$sub];
     }
     $gconf = $gconf + (array)$this->config_graph;
-- 
2.43.0