From cf68bf183ee2a43a838ab6a2b871a9f088032903 Mon Sep 17 00:00:00 2001
From: justme-1968 <justme-1968@users.noreply.github.com>
Date: Sun, 26 Jul 2015 08:03:43 +0000
Subject: [PATCH] 33_readingsGroup.pm: fixed undefined warning

git-svn-id: https://svn.fhem.de/fhem/trunk@8980 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 eaf09bd32..7448feca4 100644
--- a/fhem/FHEM/33_readingsGroup.pm
+++ b/fhem/FHEM/33_readingsGroup.pm
@@ -291,6 +291,8 @@ lookup($$$$$$$$$)
       $default = $mapping;
     }
 
+    return $default if( !defined($default) );
+
     if( !ref($default) && $default =~ m/^{.*}$/) {
       my $DEVICE = $name;
       my $READING = $reading;