CRITICAL Uncaught Error

Hi Shea,
Thanks for that.
This is the snippet with that error:

add_filter( 'woocommerce_order_item_name', 'sku_before_order_item_name', 30, 3 );
function sku_before_order_item_name( $item_name, $item, $is_visible ) {
    $product = $item->get_product();
    $sku = $product->get_sku();

    // When sku doesn't exist we exit
    if( empty( $sku ) ) return $item_name;

    $sku_text = __( 'SKU', 'woocommerce' ) . ': ' . $sku;

    // Add product permalink when argument $is_visible is true
    $product_permalink =  $is_visible ? $product->get_permalink( $item ) : '';

    if( $product_permalink )
        return sprintf( '<a href="%s">%s - %s</a>', $product_permalink, $sku_text, $item->get_name() );
    else
        return $sku_text . ' - ' . $item->get_name();
}

Unfortunately I don’t know much about PHP or coding, only very basics.
so if there is anything there that doesn’t make sense, I don’t think I’ll be able to figure it out.

I also have another error that ended up showing a critical error on my live site https://www.tilt.co.nz, when trying to print an invoice through with the plugin WooCommerce PDF Invoices, Packing Slips, Delivery Notes and Shipping Labels (wt-woocommerce-packing-list). I’m unsure if it’s a snippet issue or a WooCom PDF issue, as it’s not a constant, and only happened once with another team member.

2023-03-20T00:32:15+00:00 CRITICAL Uncaught TypeError: array_multisort(): Argument #1 ($array) must be an array or a sort flag in /srv/htdocs/wp-content/plugins/code-snippets/php/snippet-ops.php(505) : eval()'d code:92
Stack trace:
#0 /srv/htdocs/wp-content/plugins/code-snippets/php/snippet-ops.php(505) : eval()'d code(92): array_multisort(NULL, 4, Array)
#1 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(308): wf_pklist_order_by_id(Array, 'invoice', Object(wf_order))
#2 /wordpress/core/6.1.1/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)
#3 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/admin/modules/customizer/classes/class-customizer-product-table.php(1442): apply_filters('wf_pklist_alter...', Array, 'invoice', Object(wf_order))
#4 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/admin/modules/customizer/classes/class-customizer-product-table.php(215): Wf_Woocommerce_Packing_List_CustomizerLib::generate_product_table_product_row_html(Array, 'invoice', Object(wf_order))
#5 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/public/modules/invoice/invoice.php(438): Wf_Woocommerce_Packing_List_CustomizerLib::set_product_table(Array, 'invoice', '<div class="wft...', Object(wf_order))
#6 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(308): Wf_Woocommerce_Packing_List_Invoice->generate_template_html(Array, '<div class="wft...', 'invoice', Object(wf_order), NULL, NULL)
#7 /wordpress/core/6.1.1/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)
#8 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/admin/modules/customizer/customizer.php(926): apply_filters('wf_module_gener...', Array, '<div class="wft...', 'invoice', Object(wf_order), NULL, NULL)
#9 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/public/modules/invoice/invoice.php(998): Wf_Woocommerce_Packing_List_Customizer->generate_template_html('<div class="wft...', 'invoice', Object(wf_order))
#10 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/public/modules/invoice/invoice.php(964): Wf_Woocommerce_Packing_List_Invoice->generate_order_template(Array, 'TNZ-3910753488')
#11 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(308): Wf_Woocommerce_Packing_List_Invoice->print_it(Array, 'print_invoice')
#12 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#13 /wordpress/core/6.1.1/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#14 /srv/htdocs/wp-content/plugins/wt-woocommerce-packing-list/admin/class-wf-woocommerce-packing-list-admin.php(818): do_action('wt_print_doc', Array, 'print_invoice')
#15 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(308): Wf_Woocommerce_Packing_List_Admin->print_window('')
#16 /wordpress/core/6.1.1/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)
#17 /wordpress/core/6.1.1/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#18 /wordpress/core/6.1.1/wp-settings.php(617): do_action('init')
#19 /srv/htdocs/wp-config.php(97): require_once('/wordpress/core...')
#20 /wordpress/core/6.1.1/wp-load.php(55): require_once('/srv/htdocs/wp-...')
#21 /wordpress/core/6.1.1/wp-admin/admin.php(34): require_once('/wordpress/core...')
#22 /wordpress/core/6.1.1/wp-admin/index.php(10): require_once('/wordpress/core...')
#23 {main}
  thrown in /srv/htdocs/wp-content/plugins/code-snippets/php/snippet-ops.php(505) : eval()'d code on line 92

Thanks, any help would be appreciated.