Compatibility with WooCommerce PDF Invoices & Packing Slips

Hello!

I’ve recently updated your plugin on our install and have run into an error with a custom piece of code to provide compatibility for this plugin:

I got the code for functions.php from your website in reference to this thread:

However now when generating an invoice I get an error related to these lines:

	$wast = WC_Advanced_Shipment_Tracking_Actions::get_instance();
	$tracking_items = $wast->get_tracking_items( $order_id, true );

The full code is here:

	/** Remove this comment if you don't want to display tracking information in invoice PDF
		if($template_type == 'invoice' )return;
	**/
	/** Remove this comment if you don't want to display tracking information in packing slip PDF
		if($template_type == 'packing-slip' )return;
	**/
	if($template_type == 'proforma' )return;
	if($template_type == 'credit-note')return;

	$order_id = is_callable( array( $order, 'get_id' ) ) ? $order->get_id() : $order->id;

	$wast = WC_Advanced_Shipment_Tracking_Actions::get_instance();
	$tracking_items = $wast->get_tracking_items( $order_id, true );

	if($tracking_items){
		$wcast_customizer_settings = new wcast_initialise_customizer_settings();
		$tracking_info_settings = get_option('tracking_info_settings');

		$provider_header_text = $wast->get_option_value_from_array('tracking_info_settings','provider_header_text',$wcast_customizer_settings->defaults['provider_header_text']);

		$tracking_number_header_text = $wast->get_option_value_from_array('tracking_info_settings','tracking_number_header_text',$wcast_customizer_settings->defaults['tracking_number_header_text']);

		$shipped_date_header_text = $wast->get_option_value_from_array('tracking_info_settings','shipped_date_header_text',$wcast_customizer_settings->defaults['shipped_date_header_text']);

		$show_track_label = $tracking_info_settings['show_track_label'];

		$remove_date_from_tracking_info = $tracking_info_settings['remove_date_from_tracking'];

		$track_header_text = $wast->get_option_value_from_array('tracking_info_settings','track_header_text',$wcast_customizer_settings->defaults['track_header_text']);

		$display_thumbnail = $tracking_info_settings['display_shipment_provider_image'];

		if($tracking_info_settings['header_text_change']){ $shipment_tracking_header = $tracking_info_settings['header_text_change']; } else{ $shipment_tracking_header = "Tracking Information"; }

		?>
		<h2 class="header_text"><?php echo apply_filters( 'woocommerce_shipment_tracking_my_orders_title', __( $shipment_tracking_header, 'woo-advanced-shipment-tracking' ) ); ?></h2><br/>
		<table class="order-details">
			<thead>
				<tr>
					<th class=""><?php _e( $provider_header_text, 'woo-advanced-shipment-tracking' ); ?></th>
					<th class=""><?php _e( $tracking_number_header_text, 'woo-advanced-shipment-tracking' ); ?></th>
					<?php if($remove_date_from_tracking_info != 1){ ?>
					<th class="" style=""><span class="nobr"><?php _e( $shipped_date_header_text, 'woo-advanced-shipment-tracking' ); ?></span></th>
						<?php }
					?>
					<th class=""><?php if($show_track_label == 1){ _e( $track_header_text, 'woo-advanced-shipment-tracking' ); } ?></th>
				</tr>
			</thead>
			<tbody><?php
			foreach ( $tracking_items as $tracking_item ) {
				$date_shipped = date("Y-m-d");
				if(isset($tracking_item['date_shipped'])){
					$date_shipped = $tracking_item['date_shipped'];
				}
				?><tr class="tracking">
					<td class="">
						<?php
						global $wpdb;
						$woo_shippment_table_name = wc_advanced_shipment_tracking()->table;
						$shippment_provider = $wpdb->get_results( "SELECT * FROM $woo_shippment_table_name WHERE provider_name='".$tracking_item['formatted_tracking_provider']."'" );
						$custom_thumb_id = $shippment_provider['0']->custom_thumb_id;

						if($custom_thumb_id == 0){
							$src = wc_advanced_shipment_tracking()->plugin_dir_url()."assets/shipment-provider-img/".sanitize_title($tracking_item['formatted_tracking_provider']).".png";
						} else{
							$image_attributes = wp_get_attachment_image_src( $custom_thumb_id , array('60','60') );
							if($image_attributes[0]){
								$src = $image_attributes[0];
							} else{
								$src = wc_advanced_shipment_tracking()->plugin_dir_url()."assets/shipment-provider-img/icon-default.png";
							}
						}
					if($display_thumbnail == 1){ ?>
						<?php }
						echo esc_html( $tracking_item['formatted_tracking_provider'] ); ?>
					</td>
					<td class="">
						<?php echo esc_html( $tracking_item['tracking_number'] ); ?>
					</td>
					<?php
					if($remove_date_from_tracking_info != 1){ ?>
						<td class="">
							<time datetime="<?php echo date( 'Y-m-d', $date_shipped ); ?>" title="<?php echo date( 'Y-m-d', $date_shipped ); ?>"><?php echo date_i18n( get_option( 'date_format' ), $date_shipped ); ?></time>
						</td>
					<?php } ?>
					<td class="">
							<?php $url = str_replace('%number%',$tracking_item['tracking_number'],$tracking_item['formatted_tracking_link']); ?>
							<a href="<?php echo esc_url( $url ); ?>" target="_blank"><?php _e( 'Track', 'woo-advanced-shipment-tracking' ); ?></a>
					</td>
				</tr><?php
		}
		?></tbody>
		</table>
		<?php
	}
}

I wonder if someone could point me in the right direction to fix this. Unfortunately I’ve reverted our production env before I took a copy of the actual error message but I will try and dig this out and report back as soon as if you need it.