diff --git a/includes/class-wc-order-item-meta.php b/includes/class-wc-order-item-meta.php
index 7da103617c4..994bb06ba1b 100644
--- a/includes/class-wc-order-item-meta.php
+++ b/includes/class-wc-order-item-meta.php
@@ -139,7 +139,15 @@ class WC_Order_Item_Meta {
 					}
 				}
 
-				$formatted_meta[ $meta_key ] = array(
+				// Unique key required
+				$formatted_meta_key = $meta_key;
+				$loop               = 0;
+				while ( isset( $formatted_meta[ $formatted_meta_key ] ) ) {
+					$loop ++;
+					$formatted_meta_key = $meta_key . '-' . $loop;
+				}
+
+				$formatted_meta[ $formatted_meta_key ] = array(
 					'label'     => wc_attribute_label( $attribute_key ),
 					'value'     => apply_filters( 'woocommerce_order_item_display_meta_value', $meta_value ),
 				);