diff --git a/src/models/ShopOrder.php b/src/models/ShopOrder.php
index 24252ee..ac177e8 100644
--- a/src/models/ShopOrder.php
+++ b/src/models/ShopOrder.php
@@ -1771,7 +1771,7 @@ public function getDiscount_percent()
     {
         $percent = 0;
 
-        if ($this->discount_amount) {
+        if ($this->discount_amount && $this->moneyItems->amount) {
             $percent = $this->discount_amount * 100 / (float)$this->moneyItems->amount;
         }
 
diff --git a/src/models/ShopOrderItem.php b/src/models/ShopOrderItem.php
index 413af67..ab4d961 100644
--- a/src/models/ShopOrderItem.php
+++ b/src/models/ShopOrderItem.php
@@ -562,7 +562,7 @@ public function getDiscount_percent()
     {
         $percent = 0;
 
-        if ($this->discount_amount) {
+        if ($this->discount_amount && $this->amount) {
             $percent = $this->discount_amount * 100 / $this->amount;
         }