diff --git a/django_tenants/log.py b/django_tenants/log.py
index <HASH>..<HASH> 100644
--- a/django_tenants/log.py
+++ b/django_tenants/log.py
@@ -10,5 +10,5 @@ class TenantContextFilter(logging.Filter):
     """
     def filter(self, record):
         record.schema_name = connection.tenant.schema_name
-        record.domain_url = getattr(connection.tenant, 'domain_url', '')
+        record.domain_url = getattr(connection.tenant, 'domain_url', 'none')
         return True
Update log.py

it would be better for logging output to use a string that indicates blank/not set/ etc than an empty string