Media Library Not Working

Hi,

I have a very frustrating issue with a website which the media library isn’t loading any images in grid view (fine in list view).

I think it is possibly a theme plugin I have added as it works when I disable it but no idea what would be causing the issue (I think it is because I am using admin-ajax.php?

//Enqueue Ajax Scripts
function enqueue_country_ajax_scripts() {
    wp_register_script( 'filter-ajax-js', '/wp-content/themes/**/includes/plugins/suppliers/assets/js/filter.js' );
    wp_localize_script( 'filter-ajax-js', 'ajax_country_params', array( 'ajax_url' => admin_url( 'admin-ajax.php' ) ) );
    wp_enqueue_script( 'filter-ajax-js' );

    wp_enqueue_style( 'suppliers', '/wp-content/themes/***/includes/plugins/suppliers/assets/css/suppliers.css' );
}
add_action('wp_enqueue_scripts', 'enqueue_country_ajax_scripts');

If you need to see full code of the plugin let me know and I will share the code somewhere or email it to you.

EDIT – Code below:

suppliers.php – https://codepad.org/6w7UDRT3
plugin.functions.php – https://codepad.org/KkXfQFzx
suppliers.js – https://codepad.org/AdZi5j4U

Thanks in advance for your help.