From 7c95026e7f05c3d3f5b0ea52b3d299d4cc0dd84f Mon Sep 17 00:00:00 2001
From: justme1968 <justme1968@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Wed, 22 Jan 2014 14:33:50 +0000
Subject: [PATCH] one less warning

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@4713 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/33_readingsGroup.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fhem/FHEM/33_readingsGroup.pm b/fhem/FHEM/33_readingsGroup.pm
index aeea57f43..c8493ffe3 100644
--- a/fhem/FHEM/33_readingsGroup.pm
+++ b/fhem/FHEM/33_readingsGroup.pm
@@ -204,7 +204,7 @@ lookup2($$$$)
     my $vf = "";
     $vf = $lookup->{$reading} if( exists($lookup->{$reading}) );
     $vf = $lookup->{$name.".".$reading} if( exists($lookup->{$name.".".$reading}) );
-    $vf = $lookup->{$reading.".".$value} if( exists($lookup->{$reading.".".$value}) );
+    $vf = $lookup->{$reading.".".$value} if( defined($value) && exists($lookup->{$reading.".".$value}) );
     $lookup = $vf;
   } elsif($lookup =~ m/^{.*}$/) {
     my $DEVICE = $name;