diff --git a/apps/herd/models.py b/apps/herd/models.py
index 13653df..b50e1af 100644
--- a/apps/herd/models.py
+++ b/apps/herd/models.py
@@ -137,4 +137,4 @@ class Rancher(BaseModel):
         return f'rancher: {self.first_name} {self.last_name}'
 
     def save(self, *args, **kwargs):
-        return super(Rancher, self).save(*args, **kwargs)
\ No newline at end of file
+        return super(Rancher, self).save(*args, **kwargs)
diff --git a/apps/warehouse/pos/api/v1/serializers.py b/apps/warehouse/pos/api/v1/serializers.py
index bab4d4f..9be718a 100644
--- a/apps/warehouse/pos/api/v1/serializers.py
+++ b/apps/warehouse/pos/api/v1/serializers.py
@@ -123,8 +123,9 @@ class InventoryQuotaSaleTransactionSerializer(serializers.ModelSerializer):
         items_data = self.context['request'].data['items']
         with atomic():
             # get rancher with national code
-            rancher = Rancher.objects.get(national_code=validated_data.pop('rancher_national_code'))
-            validated_data.update({'rancher': rancher})
+            if 'rancher_national_code' in validated_data.keys():
+                rancher = Rancher.objects.get(national_code=validated_data.pop('rancher_national_code'))
+                validated_data.update({'rancher': rancher})
 
             # if transaction exists, update transaction status
             transaction = self.Meta.model.objects.filter(