Small bug in Loader.php

Hello,

I believe there is a small bug in your latest update (1.16.1) for MB AIO in

/meta-box-aio/vendor/meta-box/mb-settings-page/src/Loader.php

on line 22:

return strlen( $a['parent'] ) - strlen( $b['parent'] );

--

I added an isset check and everything seems to be working fine.

usort( $settings_pages, function ( $a, $b ) {
    if ( isset( $a['parent'] ) ) {
        return strlen( $a['parent'] ) - strlen( $b['parent'] );
    }
} );

Regards,
Sam Hayman