The documentation lists this format for using bind values:
$rv = $dbh->do($statement, \%attr, @bind_values);
I am surprised that your snippet even compiles or passes the SQL parser, but in any case, I don't think that you are doing what you think you are doing.
To expand on the synopsis example, do:
my $statement = q{INSERT INTO....};
my %attr = ();
my @bind_values = ( 'NULL', $first, $last );
my $rv = $dbh->do( $statement, \%attr, @bind_values );
and see what happens.
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