From e98e2c8425013448d2b446b3ff81ca75041bff74 Mon Sep 17 00:00:00 2001
From: rudolfkoenig <>
Date: Fri, 14 Apr 2017 15:01:35 +0000
Subject: [PATCH] fhem.pl: add undef check to AttrNum (Forum #70496)

git-svn-id: https://svn.fhem.de/fhem/trunk@13989 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/fhem.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 0772743ee..6fea658bd 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -4042,6 +4042,7 @@ AttrNum($$$;$)
 {
   my ($d,$n,$default,$round) = @_;
   my $val = AttrVal($d,$n,$default);
+  return undef if(!defined($val));
   $val = ($val =~ /(-?\d+(\.\d+)?)/ ? $1 : "");
   $val = round($val,$round) if($round);
   return $val;