Custom query pagination problem with php parameter as arg - wordpress

Question

I have create a loop with a custom query. This query contains a php parameters that i m getting from url with GET method. This the code at my loop page:
$cat = get_queried_object();
echo '<h1 class="childcatdes">'. $cat->name . '</h1>';
echo '<p class="childcatdescr">'. $cat->description . '<br><br></p>';
do_action( 'woocommerce_before_single_product' );
$posts_per_page = 12;
$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$product_args = array(
'post_type' => 'product',
'posts_per_page' => $posts_per_page,
'paged' => $paged,
'page' => $paged,
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'product_cat',
'field' => 'name',
'terms' => $cat->name,
),
array(
'taxonomy' => 'manufacturers',
'field' => 'slug',
'terms' => $_GET['filter_manufacturers'],
'operator' => 'IN'
)
),
'orderby' => 'name',
'order' => 'ASC',
);
$custom_query = new WP_Query( $product_args );
if($custom_query->have_posts()) {
echo '<ul';
while ($custom_query->have_posts() ) : $custom_query->the_post();
echo '<li>';
$link = get_the_permalink();
echo '' . get_the_title() . '';
echo '</li>';
endwhile;
echo '</ul>';
}
else {
echo 'No post found.';
}
?>
<nav class="pagination">
<?php pagination_bar( $custom_query); ?>
</nav>
And i use this code to my functions.php file for the function pagination_bar
function pagination_bar( $custom_query) {
$total_pages = $custom_query->max_num_pages;
$big = 999999999; // need an unlikely integer
if ($total_pages > 1){
$current_page = max(1, get_query_var('paged'));
echo paginate_links(array(
'base' => preg_replace('/\?.*/', '/', get_pagenum_link(1)) . '%_%',
'current' => $current_page,
'format' => 'page/%#%/',
'total' => $custom_query->max_num_pages,
'add_args' => array(
'filter_manufacturers' => $_GET['filter_manufacturers'],
)
));
}
}
The problem is that the pagination (even if it counts the posts correct at first page) is not working correct. I 'm getting 404 error at second page.