diff --git a/fhem/FHEM/HttpUtils.pm b/fhem/FHEM/HttpUtils.pm
index fdfd4f0b0..194273787 100644
--- a/fhem/FHEM/HttpUtils.pm
+++ b/fhem/FHEM/HttpUtils.pm
@@ -643,7 +643,7 @@ HttpUtils_Connect2($)
     $data = $hdr.(defined($data) ? $data:"");
     $hash->{directWriteFn} = sub($) { # Nonblocking write
       my $ret = syswrite $hash->{conn}, $data;
-      if($ret <= 0) {
+      if(!defined($ret) || $ret <= 0) {
         return if($! == EAGAIN);
         my $err = $!;
         RemoveInternalTimer(\%timerHash);