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 f6db6c0..d8a59d4 100644
--- a/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
+++ b/apps/product/web/api/v1/serializers/quota_distribution_serializers.py
@@ -38,7 +38,7 @@ class QuotaDistributionSerializer(serializers.ModelSerializer):
         assigned_organization = data['assigned_organization']
         amount = data['weight']
         instance_id = self.instance.id if self.instance else None
-        parent_distribution = data['parent_distribution'] or None
+        parent_distribution = data['parent_distribution'] if 'parent_distribution' in data.keys() else None
 
         # check quota expired time
         if not quota.is_in_valid_time():