From 1265bc8470911d90c7c446c64976207c3285a151 Mon Sep 17 00:00:00 2001
From: Oliver Gorwits <oliver@cpan.org>
Date: Sat, 2 Mar 2019 14:52:21 +0000
Subject: [PATCH] #520 catch slave ports defined without a master

---
 lib/App/Netdisco/Worker/Plugin/Discover/Properties.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/App/Netdisco/Worker/Plugin/Discover/Properties.pm b/lib/App/Netdisco/Worker/Plugin/Discover/Properties.pm
index 63240c3d..95d2340d 100644
--- a/lib/App/Netdisco/Worker/Plugin/Discover/Properties.pm
+++ b/lib/App/Netdisco/Worker/Plugin/Discover/Properties.pm
@@ -238,6 +238,7 @@ register_worker({ phase => 'early', driver => 'snmp' }, sub {
   # must do this after building %interfaces so that we can set is_master
   foreach my $sidx (keys %$agg_ports) {
       my $slave  = $interfaces->{$sidx} or next;
+      next unless defined $agg_ports->{$sidx}; # slave without a master?!
       my $master = $interfaces->{ $agg_ports->{$sidx} } or next;
       next unless exists $interfaces{$slave} and exists $interfaces{$master};