diff --git a/xCAT-server/sbin/xcatd b/xCAT-server/sbin/xcatd
index 2c375d4d3..efc1d7838 100755
--- a/xCAT-server/sbin/xcatd
+++ b/xCAT-server/sbin/xcatd
@@ -973,11 +973,13 @@ if ($inet6support) {
     $peerfqdn=$peerhost;
     my $peerhostorg=$peerhost;  # save original with domain for validation
 
-	my @hosts;
-	push (@hosts, $peerhost);
-	my $nd = xCAT::NetworkUtils->getNodeDomains(\@hosts);
-	my %nodedomains = %$nd;
-	$domain = $nodedomains{$peerhost};
+	if ($peerhost) {
+		my @hosts;
+		push (@hosts, $peerhost);
+		my $nd = xCAT::NetworkUtils->getNodeDomains(\@hosts);
+		my %nodedomains = %$nd;
+		$domain = $nodedomains{$peerhost};
+	}
 
     if ($domain) {
         # strip off domain if set