From e77657a1219a443b3679086729144c5df40a9d3a Mon Sep 17 00:00:00 2001
From: Calvo <luis.calvo@pandorafms.com>
Date: Tue, 23 May 2023 17:56:41 +0200
Subject: [PATCH] Fix nmap os detection with OS details

---
 pandora_server/lib/PandoraFMS/DiscoveryServer.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandora_server/lib/PandoraFMS/DiscoveryServer.pm b/pandora_server/lib/PandoraFMS/DiscoveryServer.pm
index f17d2c5363..a556334ee0 100644
--- a/pandora_server/lib/PandoraFMS/DiscoveryServer.pm
+++ b/pandora_server/lib/PandoraFMS/DiscoveryServer.pm
@@ -433,7 +433,7 @@ sub PandoraFMS::Recon::Base::guess_os($$;$) {
     return OS_OTHER if ($? != 0);
     my $str_os;
     if ($return =~ /Aggressive OS guesses:\s*(.*)|OS details:\s(.*)/) {
-      if($1 ne "") {
+      if(defined($1) && $1 ne "") {
         $str_os = $1;
       } else {
         $str_os = $2;