diff --git a/postfix-policyd-spf-perl b/postfix-policyd-spf-perl
index 9c6c92c..2ede3e6 100755
--- a/postfix-policyd-spf-perl
+++ b/postfix-policyd-spf-perl
@@ -156,9 +156,11 @@ while (<STDIN>) {
 sub exempt_localhost {
     my %options = @_;
     my $attr = $options{attr};
-    my $client_address = NetAddr::IP->new($attr->{client_address});
-    return 'PREPEND X-Comment SPF not applicable to localhost connection, skipped check'
-        if grep($_->contains($client_address), localhost_addresses);
+    if ($attr->{client_address} != '') {
+        my $client_address = NetAddr::IP->new($attr->{client_address});
+        return 'PREPEND X-Comment SPF not applicable to localhost connection, skipped check'
+            if grep($_->contains($client_address), localhost_addresses);
+    };
     return 'DUNNO';
 }