From 53dbe57e9c8e15636a1e217d519f4545d4ed3ed2 Mon Sep 17 00:00:00 2001
From: rudolfkoenig <>
Date: Mon, 26 Oct 2020 20:31:42 +0000
Subject: [PATCH] 98_telnet.pm: avoid crash if async output channel is closed

git-svn-id: https://svn.fhem.de/fhem/trunk@23035 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/98_telnet.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fhem/FHEM/98_telnet.pm b/fhem/FHEM/98_telnet.pm
index 20bf865c3..7bd904a07 100644
--- a/fhem/FHEM/98_telnet.pm
+++ b/fhem/FHEM/98_telnet.pm
@@ -292,7 +292,7 @@ telnet_Output($$$)
 {
   my ($hash,$ret,$nonl) = @_;
 
-  if($ret) {
+  if($ret && defined($hash->{CD})) {
     $ret = utf8ToLatin1($ret) if( $hash->{encoding} eq "latin1" );
     if(!$nonl) {        # AsyncOutput stuff
       $ret = "\n$ret\n$hash->{prompt} " if( $hash->{showPrompt});