diff --git a/apps/product/web/api/v1/serializers/quota_distribution_serializers.py b/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
index 103033f..20d98e2 100644
--- a/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
+++ b/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
@@ -56,17 +56,17 @@ class QuotaDistributionSerializer(serializers.ModelSerializer):
         if total + amount > quota.quota_weight:
             raise QuotaWeightException()
 
-        # total warehouse inventory entry
-        total_entry = self.instance.inventory_entry.aggregate(
-            total=models.Sum('weight')
-        )['total'] or 0
-
-        # if inventory entry weight is bigger than distribute weight in edit distribution
-        if total_entry > self.instance.weight:
-            raise APIException("وزن وارد شده کمتر از وزن ورودی به انبار است", code=403)  # noqa
-
-        # if weight is more than distribution remaining weight
         if self.instance:
+            # total warehouse inventory entry
+            total_entry = self.instance.inventory_entry.aggregate(
+                total=models.Sum('weight')
+            )['total'] or 0
+
+            # if inventory entry weight is bigger than distribute weight in edit distribution
+            if total_entry > self.instance.weight:
+                raise APIException("وزن وارد شده کمتر از وزن ورودی به انبار است", code=403)  # noqa
+
+            # if weight is more than distribution remaining weight
             if self.instance.weight > self.instance.remaining_weight:
                 raise APIException("وزن وارد شده بیشتر از وزن باقیمانده است", code=403)  # noqa