diff --git a/backend/order/models.py b/backend/order/models.py
index 30af675..f7efb32 100644
--- a/backend/order/models.py
+++ b/backend/order/models.py
@@ -75,7 +75,7 @@ class OrderModel(models.Model):
 class OrderItemModel(models.Model):
     order = models.ForeignKey(OrderModel, on_delete=models.CASCADE, related_name='items', verbose_name='سفارش')
     quantity = models.SmallIntegerField(verbose_name="تعداد")
-    product = models.ForeignKey(ProductModel, on_delete=models.CASCADE, verbose_name="محصول")
+    product = models.ForeignKey(ProductModel, on_delete=models.PROTECT, verbose_name="محصول")
     class Meta:
         verbose_name = 'محصول خریداری شده'
         verbose_name_plural = 'محصولات خریداری شده'