Netmask doesn't show under Ports

[rasssta]

In resources/views/customer/overview-tabs/ports/port.foil.php you can find these lines:

<?= $t->ee( $vli->getIPv6Address()->getAddress() ) ?> <?php if( isset( $netinfo[ $vlanid ][ 6 ][ 'masklen' ] ) ) : ?> /<?= $netinfo[ $vlanid ][ 6 ][ "masklen" ] ?> <?php endif;?>

<?= $t->ee( $vli->getIPv4Address()->getAddress() ) ?> <?php if( isset( $netinfo[ $vlanid ][ 4 ][ 'masklen' ] ) ) : ?> /<?= $netinfo[ $vlanid ][ 4 ][ "masklen" ] ?> <?php endif;?>

But the netmask doesn't show in the web interface. It DOES however show in the welcome e-mail.