Installing WordPress 4.6

Hi,

I get an error installing WordPress 4.6 on IIS (Windows 2012 R2) / PHP 5.6 and MySql 5.6.30).
Specifically “WordPress errore database Unknown column ‘wp_’ in ‘field list’ ” by the section below on \wp-admin\setup-config.php:

$wpdb->query( "SELECT $prefix" );
if ( ! $wpdb->last_error ) {
// MySQL was able to parse the prefix as a value, which we don't want. Bail.
wp_die( __( '<strong>ERROR</strong>: "Table Prefix" is invalid.' ) );
}

If I remove this section, I’m able to complete the installation.

Any idea?

Thanks in advance