diff --git a/lib/CMTD/Helpers.pm b/lib/CMTD/Helpers.pm
index 659ad3c..90b7a75 100644
--- a/lib/CMTD/Helpers.pm
+++ b/lib/CMTD/Helpers.pm
@@ -125,10 +125,10 @@ sub register {
     my ($c, $pid, $cm) = @_;
     my $table = 'comments';
     $c->app->db->begin;
-    my $seq = $c->app->db->select($table, 'max(seq)', {pid => $pid})->list;
+    my $seq = $c->app->db->select($table, 'max(seq)', {pid => $pid})->list || 0;
     $c->app->db->insert($table, {
       pid  => $pid,
-      seq  => $seq,
+      seq  => $seq + 1,
       date => time(),
       name  => $cm->{name},
       reply => $cm->{reply},