--- deliantra/server/ext/commands.ext	2007/03/02 12:16:55	1.29
+++ deliantra/server/ext/commands.ext	2007/03/02 14:24:53	1.30
@@ -118,7 +118,7 @@
 cf::register_command mark => sub {
    my ($pl, $arg) = @_;
 
-   if (!$arg) {
+   unless (length $arg) {
       my $ob = $pl->find_marked_object;
 
       $pl->reply (undef, $ob