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-rw-r--r--lib/PublicInbox/Msgmap.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index d474bade..0035c9e3 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -130,7 +130,7 @@ INSERT OR IGNORE INTO msgmap (mid) VALUES (?)
 
         return if $sth->execute($mid) == 0;
         my $num = $dbh->last_insert_id(undef, undef, 'msgmap', 'num');
-        $self->num_highwater($num) unless !defined($num);
+        $self->num_highwater($num) if defined($num);
         $num;
 }