diff --git a/common/modules/product/models/ProductStock.php b/common/modules/product/models/ProductStock.php
index c667ada..57b1952 100755
--- a/common/modules/product/models/ProductStock.php
+++ b/common/modules/product/models/ProductStock.php
@@ -75,4 +75,10 @@ class ProductStock extends \yii\db\ActiveRecord
     {
         return $this->hasOne(Stock::className(), ['stock_id' => 'stock_id']);
     }
+
+
+    public static function primaryKey()
+    {
+        return ["product_id"];
+    }
 }
--
libgit2 0.21.4