From 845c25f87c4cfa25058f561b938c487b224af00e Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Thu, 14 Nov 2019 22:16:33 +0100
Subject: dhcp-to-dns: act on hostname only if available

---
 dhcp-to-dns | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dhcp-to-dns b/dhcp-to-dns
index 81b2964..edb50b4 100644
--- a/dhcp-to-dns
+++ b/dhcp-to-dns
@@ -49,7 +49,9 @@
       :set ($LeaseVal->"address") [ / ip dhcp-server lease get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) address ];
     }
 
-    :set ($LeaseVal->"address") [ / ip dhcp-server lease get ([ find where host-name=($LeaseVal->"host-name") dynamic=yes ]->0) address ];
+    :if ([ :len ($LeaseVal->"host-name") ] > 0) do={
+      :set ($LeaseVal->"address") [ / ip dhcp-server lease get ([ find where host-name=($LeaseVal->"host-name") dynamic=yes ]->0) address ];
+    }
 
     :if ($DnsIp = $LeaseVal->"address") do={
       :log debug ("DNS entry for " . $Fqdn . " does not need updating.");
-- 
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