From 32f8142c917f1f2f5f56865b229aa95ee99de9c7 Mon Sep 17 00:00:00 2001
From: pierrebuet <pierrebuet@mac.com>
Date: Fri, 24 Mar 2017 12:13:00 +0000
Subject: [PATCH] Fixes #13748

---
 includes/admin/meta-boxes/views/html-order-item.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/includes/admin/meta-boxes/views/html-order-item.php b/includes/admin/meta-boxes/views/html-order-item.php
index 9a71fdefb80..2e5bbbda402 100644
--- a/includes/admin/meta-boxes/views/html-order-item.php
+++ b/includes/admin/meta-boxes/views/html-order-item.php
@@ -121,7 +121,11 @@ $thumbnail    = $product ? apply_filters( 'woocommerce_admin_order_item_thumbnai
 							}
 
 							if ( $item->get_subtotal() !== $item->get_total() ) {
-								echo '<span class="wc-order-item-discount">-' . wc_price( wc_round_tax_total( $tax_item_subtotal - $tax_item_total ), array( 'currency' => $order->get_currency() ) ) . '</span>';
+								if ( '' === $tax_item_total ) {
+									echo '<span class="wc-order-item-discount">&ndash;</span>';
+								} else {
+									echo '<span class="wc-order-item-discount">-' . wc_price( wc_round_tax_total( $tax_item_subtotal - $tax_item_total ), array( 'currency' => $order->get_currency() ) ) . '</span>';
+								}
 							}
 
 							if ( $refunded = $order->get_tax_refunded_for_item( $item_id, $tax_item_id ) ) {