From 745fea37e2590d3923f374103b79dd295f3b4102 Mon Sep 17 00:00:00 2001
From: Marko Oldenburg <fhemdevelopment@cooltux.net>
Date: Sat, 24 Dec 2022 12:57:41 +0100
Subject: [PATCH] fix undefined value

Can't use an undefined value as an ARRAY reference at ./FHEM/59_Weather.pm line 589
---
 FHEM/59_Weather.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/FHEM/59_Weather.pm b/FHEM/59_Weather.pm
index ebcada5..9af9e3f 100755
--- a/FHEM/59_Weather.pm
+++ b/FHEM/59_Weather.pm
@@ -586,7 +586,9 @@ sub Weather_WriteReadings {
     else {
         Weather_DeleteAlertsReadings($hash);
         readingsBulkUpdate( $hash, 'warnCount',
-            scalar( @{ $dataRef->{alerts} } ) );
+            scalar( @{ $dataRef->{alerts} } ) )
+          if ( defined( $dataRef->{alerts} )
+            && ref( $dataRef->{alerts} ) eq 'ARRAY' );
     }
 
     ### state