From 8a4d617c63a016fdf29be17c608aa14195f5e917 Mon Sep 17 00:00:00 2001
From: justme1968 <justme1968@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Mon, 16 Mar 2015 20:08:03 +0000
Subject: [PATCH] 33_readingsGroup.pm: fixed  uninitialized value  warning

git-svn-id: https://svn.fhem.de/fhem/trunk@8227 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/33_readingsGroup.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fhem/FHEM/33_readingsGroup.pm b/fhem/FHEM/33_readingsGroup.pm
index 69cd9b141..f78de78af 100644
--- a/fhem/FHEM/33_readingsGroup.pm
+++ b/fhem/FHEM/33_readingsGroup.pm
@@ -336,6 +336,8 @@ lookup2($$$$;$$)
     $lookup = $vf;
   }
 
+  return undef if( !defined($lookup) );
+
   if( !ref($lookup) && $lookup =~ m/^{.*}$/) {
     my $DEVICE = $name;
     my $READING = $reading;