diff --git a/includes/admin/meta-boxes/views/html-order-item.php b/includes/admin/meta-boxes/views/html-order-item.php
index fbb3a3c11cd..aa3141877f0 100644
--- a/includes/admin/meta-boxes/views/html-order-item.php
+++ b/includes/admin/meta-boxes/views/html-order-item.php
@@ -198,7 +198,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	</td>
 
 	<?php
-		if ( ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
+		if ( isset( $legacy_order ) && ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
 			$line_tax_data = isset( $item['line_tax_data'] ) ? $item['line_tax_data'] : '';
 			$tax_data      = maybe_unserialize( $line_tax_data );
 
diff --git a/includes/admin/meta-boxes/views/html-order-items.php b/includes/admin/meta-boxes/views/html-order-items.php
index d1b21f3e933..b1d1d9b2fb4 100644
--- a/includes/admin/meta-boxes/views/html-order-items.php
+++ b/includes/admin/meta-boxes/views/html-order-items.php
@@ -45,7 +45,7 @@ if ( 'yes' == get_option( 'woocommerce_calc_taxes' ) ) {
 				<th class="line_cost"><?php _e( 'Total', 'woocommerce' ); ?></th>
 
 				<?php
-					if ( ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
+					if ( isset( $legacy_order ) && ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
 						foreach ( $order_taxes as $tax_id => $tax_item ) :
 							$tax_class      = wc_get_tax_class_by_tax_id( $tax_item['rate_id'] );
 							$tax_class_name = isset( $classes_options[ $tax_class ] ) ? $classes_options[ $tax_class ] : __( 'Tax', 'woocommerce' );
diff --git a/includes/admin/meta-boxes/views/html-order-shipping.php b/includes/admin/meta-boxes/views/html-order-shipping.php
index 2cb1b4c8128..c09a8d76ba3 100644
--- a/includes/admin/meta-boxes/views/html-order-shipping.php
+++ b/includes/admin/meta-boxes/views/html-order-shipping.php
@@ -67,7 +67,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	</td>
 
 	<?php
-		if ( ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
+		if ( isset( $legacy_order ) && ! $legacy_order && 'yes' == get_option( 'woocommerce_calc_taxes' ) ) :
 			$shipping_taxes = isset( $item['taxes'] ) ? $item['taxes'] : '';
 			$tax_data       = maybe_unserialize( $shipping_taxes );