I have this global that returns the category name on the details page. If I call with a GT filter tag I get an error. How can I fix this please?

<%ucfirst Cat_Name%>

sub {
my $tags = shift;
my $id = $tags->{'ID'};
my $db = $DB->table ('Category','CatLinks');
$db->select_options('LIMIT 1');
my $catid = $db->select ( { LinkID => $id }, ['Name'] )->fetchrow_array;
$catid =~ tr/A-Z/a-z/;
return $catid;
}


RETURNS:

Error: Variable 'Cat_Name' is not scalar

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