From ace8bc76641b7f3f256c25a0a16fe1bb757429af Mon Sep 17 00:00:00 2001
From: rudolfkoenig <>
Date: Mon, 25 May 2015 11:21:31 +0000
Subject: [PATCH] 00_ZWdongle.pm: fix warning (Forum #37489)

git-svn-id: https://svn.fhem.de/fhem/trunk/fhem@8633 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 FHEM/00_ZWDongle.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/FHEM/00_ZWDongle.pm b/FHEM/00_ZWDongle.pm
index 173264118..16c7d3933 100755
--- a/FHEM/00_ZWDongle.pm
+++ b/FHEM/00_ZWDongle.pm
@@ -574,7 +574,7 @@ ZWDongle_ReadAnswer($$$)
   return ("No FD (dummy device?)", undef)
         if(!$hash || ($^O !~ /Win/ && !defined($hash->{FD})));
   my $to = ($hash->{RA_Timeout} ? $hash->{RA_Timeout} : 3);
-  Log3 $hash, 4, "ZWDongle_ReadAnswer arg:$arg regexp:$regexp";
+  Log3 $hash, 4, "ZWDongle_ReadAnswer arg:$arg regexp:".($regexp ? $regexp:"");
 
   for(;;) {