diff --git a/apps/product/models.py b/apps/product/models.py
index ce9d209..9d7e9a5 100644
--- a/apps/product/models.py
+++ b/apps/product/models.py
@@ -545,7 +545,7 @@ class Quota(BaseModel):
             stat = OrganizationQuotaStats.objects.filter(
                 quota=self,
             )
-        return stat.first()
+        return stat.first() if stat.exists() else None
 
     def soft_delete(self):
         self.trash = True
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 7db66d9..2d1e471 100644
--- a/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
+++ b/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
@@ -9,11 +9,8 @@ from apps.product.exceptions import (
     QuotaExpiredTimeException,
     QuotaLimitByOrganizationException
 )
-from apps.product.web.api.v1.serializers.quota_serializers import (
-    QuotaSerializer,
-    QuotaBrokerValueSerializer,
-    product_serializers
-)
+from apps.product.pos.api.v1.serializers import product_serializers
+from apps.product.pos.api.v1.serializers.quota_serializers import QuotaBrokerValueSerializer, QuotaSerializer
 
 
 class QuotaDistributionSerializer(serializers.ModelSerializer):
@@ -99,13 +96,17 @@ class QuotaDistributionSerializer(serializers.ModelSerializer):
 
         representation = super().to_representation(instance)
 
+        quota = instance.quota
+        assigned_org = instance.assigned_organization
+        assigner_org = instance.assigner_organization
+
         # get org quota stat detail
-        quotas_stat_amount = instance.quota.quota_amount_by_org(instance.assigned_organization)
+        quotas_stat_amount = instance.quota.quota_amount_by_org(assigned_org)
 
         # get quota stat for list of pricing features
-        quota_stat = instance.get_quota_stat(
-            instance.assigned_organization
-        ) if instance.quota.edited_pricing_features else None
+        quota_stat = quota.get_quota_stat(
+            assigned_org
+        ) if quota.edited_pricing_features else None
 
         representation['remaining_weight'] = quotas_stat_amount['remaining_weight']
         representation['distributed'] = quotas_stat_amount['quota_distributed']
@@ -114,32 +115,32 @@ class QuotaDistributionSerializer(serializers.ModelSerializer):
         representation['been_sold'] = quotas_stat_amount['been_sold']
 
         representation['attribute_values'] = product_serializers.AttributeValueSerializer(
-            instance.quota.attribute_values.filter(org_quota_stat=quota_stat),
+            quota.attribute_values.filter(org_quota_stat=quota_stat),
             many=True
         ).data
 
         representation['brokers'] = QuotaBrokerValueSerializer(
-            instance.quota.broker_values.filter(org_quota_stat=quota_stat),
+            quota.broker_values.filter(org_quota_stat=quota_stat),
             many=True
         ).data
 
-        if instance.quota:
-            representation['quota'] = QuotaSerializer(instance.quota).data
+        if quota:
+            representation['quota'] = QuotaSerializer(quota).data
 
-        if instance.assigned_organization:
+        if assigned_org:
             representation['assigned_organization'] = {
-                'organization': instance.assigned_organization.name,
-                'id': instance.assigned_organization.id,
+                'organization': assigned_org.name,
+                'id': assigned_org.id,
                 # if distributor is 0 , organization has not any distribute
-                'is_distributor': instance.quota.distributions_assigned.filter(
-                    assigner_organization=instance.assigned_organization
+                'is_distributor': quota.distributions_assigned.filter(
+                    assigner_organization=assigned_org
                 ).count()
             }
 
-        if instance.assigner_organization:
+        if assigner_org:
             representation['assigner_organization'] = {
-                'organization': instance.assigner_organization.name,
-                'id': instance.assigner_organization.id
+                'organization': assigner_org.name,
+                'id': assigner_org.id
             }
 
         if instance.parent_distribution:
diff --git a/apps/product/web/api/v1/viewsets/quota_api.py b/apps/product/web/api/v1/viewsets/quota_api.py
index 7651f49..fdfe219 100644
--- a/apps/product/web/api/v1/viewsets/quota_api.py
+++ b/apps/product/web/api/v1/viewsets/quota_api.py
@@ -438,7 +438,16 @@ class QuotaViewSet(BaseViewSet, SoftDeleteMixin, viewsets.ModelViewSet, DynamicS
         try:
             quota = self.get_object()
             queryset = self.filter_query(
-                quota.distributions_assigned.filter(
+                quota.distributions_assigned.select_related(
+                    "quota",
+                    "assigned_organization",
+                    "assigner_organization",
+                    "parent_distribution",
+                ).prefetch_related(
+                    "quota__attribute_values",
+                    "quota__broker_values",
+                    "quota__distributions_assigned",
+                ).filter(
                     Q(assigner_organization=my_org) |
                     Q(assigned_organization__in=my_org_child_list)
                 ).order_by('-modify_date')