diff --git a/Build.PL b/Build.PL
index c4bdb69d..b7ae527a 100644
--- a/Build.PL
+++ b/Build.PL
@@ -53,6 +53,7 @@ Module::Build->new(
     'NetAddr::MAC' => '0.93',
     'NetAddr::IP' => '4.068',
     'Opcode' => '1.07',
+    'Package::DeprecationManager' => '0',
     'Path::Class' => '0.32',
     'Plack' => '1.0023',
     'Plack::Handler::Twiggy' => '0',
diff --git a/Changes b/Changes
index f4eff19d..ab1c617e 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,12 @@
+2.039021 - 2018-04-
+
+  [BUG FIXES]
+
+  * #389 build/upgrade issues (EL6)
+  * #390 cannot take logarithm of zero (C. Stromsoe)
+  * protect against undef mac (l.e. ferguson)
+  * do not include logical aggregate masters in netmap/speed calc
+
 2.039020 - 2018-03-26
 
   [ENHANCEMENTS]
diff --git a/bin/netdisco-sshcollector b/bin/netdisco-sshcollector
index ccf12357..d77932a1 100755
--- a/bin/netdisco-sshcollector
+++ b/bin/netdisco-sshcollector
@@ -76,6 +76,7 @@ Dancer::Logger->init('console', $CONFIG);
 
 MCE::Loop::init { chunk_size => 1 };
 my %stats;
+$stats{entry} = 0;
 
 exit main();
 
@@ -130,13 +131,11 @@ sub process {
     my $arpentries = [ $device->arpnip($hostlabel, $ssh, $args) ];
 
     # debug p $arpentries;
-    if (scalar @$arpentries) {
-        hostnames_resolve_async($arpentries);
-        return [$hostlabel, $arpentries];
-    }
-    else {
+    if (not scalar @$arpentries) {
         warning "WARNING: no entries received from <$hostlabel>";
     }
+    hostnames_resolve_async($arpentries);
+    return [$hostlabel, $arpentries];
 }
 
 sub store_arpentries {
diff --git a/lib/App/Netdisco/Web/Plugin/Search/Node.pm b/lib/App/Netdisco/Web/Plugin/Search/Node.pm
index f369ad99..45394e2c 100644
--- a/lib/App/Netdisco/Web/Plugin/Search/Node.pm
+++ b/lib/App/Netdisco/Web/Plugin/Search/Node.pm
@@ -23,6 +23,7 @@ ajax '/ajax/content/search/node' => require_login sub {
     my ( $start, $end ) = param('daterange') =~ m/(\d+-\d+-\d+)/gmx;
 
     my $mac = NetAddr::MAC->new(mac => $node);
+    undef $mac if ($mac and $mac->as_ieee and ($mac->as_ieee eq '00:00:00:00'));
     my @active = (param('archived') ? () : (-bool => 'active'));
 
     my (@times, @wifitimes, @porttimes);
diff --git a/lib/App/Netdisco/Web/Search.pm b/lib/App/Netdisco/Web/Search.pm
index c1684f64..2d2cb01d 100644
--- a/lib/App/Netdisco/Web/Search.pm
+++ b/lib/App/Netdisco/Web/Search.pm
@@ -39,6 +39,7 @@ get '/search' => require_login sub {
             my $nd = $s->resultset('Device')->search_fuzzy($q);
             my ($likeval, $likeclause) = sql_match($q);
             my $mac = NetAddr::MAC->new($q);
+            undef $mac if ($mac and $mac->as_ieee and ($mac->as_ieee eq '00:00:00:00'));
 
             if ($nd and $nd->count) {
                 if ($nd->count == 1) {
diff --git a/lib/App/Netdisco/Worker/Plugin/Discover/Neighbors.pm b/lib/App/Netdisco/Worker/Plugin/Discover/Neighbors.pm
index 532443c2..2fd3b809 100644
--- a/lib/App/Netdisco/Worker/Plugin/Discover/Neighbors.pm
+++ b/lib/App/Netdisco/Worker/Plugin/Discover/Neighbors.pm
@@ -288,13 +288,26 @@ sub store_neighbors {
       # update master of our aggregate to be a neighbor of
       # the master on our peer device (a lot of iffs to get there...).
       # & cannot use ->neighbor prefetch because this is the port insert!
-      if ($peer_device and $peer_device->in_storage and defined $portrow->slave_of) {
+      if (defined $portrow->slave_of) {
+
+          my $peer_device = get_device($remote_ip);
           my $master = schema('netdisco')->resultset('DevicePort')->single({
             ip => $device->ip,
             port => $portrow->slave_of
           });
 
+<<<<<<< HEAD
           if ($master and not ($portrow->is_master or defined $master->slave_of)) {
+=======
+          if ($peer_device and $peer_device->in_storage and $master
+              and not ($portrow->is_master or defined $master->slave_of)) {
+
+              my $peer_port = schema('netdisco')->resultset('DevicePort')->single({
+                ip   => $peer_device->ip,
+                port => $portrow->remote_port,
+              });
+
+>>>>>>> master
               $master->update({
                   remote_ip => ($peer_device->ip || $remote_ip),
                   remote_port => ($peer_port ? $peer_port->slave_of : undef ),
@@ -309,6 +322,7 @@ sub store_neighbors {
   return @to_discover;
 }
 
+<<<<<<< HEAD
 sub long_port {
   my $port = shift or return '';
   $port =~ s/^([a-z]{2})(\d.+)$/$1%$2/i;
@@ -323,6 +337,8 @@ sub short_port {
   return (($start && $end) ? "${start}${end}" : $port);
 }
 
+=======
+>>>>>>> master
 # take data from the topology table and update remote_ip and remote_port
 # in the devices table. only use root_ips and skip any bad topo entries.
 sub set_manual_topology {