Not working with query with custom field

Hi!

In category.php, I’ve got a query:

<?php
  $idcategoria = get_query_var('cat');
  $array1 = new WP_Query(array('cat'=> $idcategoria, 'fields'=> 'ids','meta_key' => 'premium', 'meta_value' => '1','orderby' => 'rand'));
  $array2 = new WP_Query(array('cat'=> $idcategoria, 'fields'=> 'ids', 'meta_key' => 'premium', 'meta_value' => '0','orderby' => 'rand'));
  $ids = array_merge($array1->posts, $array2->posts);
  $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
  $result = new WP_Query(array('post__in' => $ids,'orderby' => 'post__in','posts_per_page'=>10,'paged' => $paged,));
?>
<?php if( $result->have_posts() ): while( $result->have_posts() ): $result->the_post();?>          ... content....
<?php endwhile; endif; ?>
<div id="pagination">
  <?php if(function_exists('wp_pagenavi')) :  wp_pagenavi(array( 'query' => $result ));  endif; wp_reset_query();?>
</div>

When shows results from category with ‘premium’ custom field everything works perfect, but when is any other category wp-pagnavi is not showing.

Any ideas?

Thank you!

https://wordpress.org/plugins/wp-pagenavi/