diff --git a/appbase/businessdate.py b/appbase/businessdate.py
index d4e4814..dc72e8c 100644
--- a/appbase/businessdate.py
+++ b/appbase/businessdate.py
@@ -8,7 +8,10 @@ def get_dbname():
 	f = env.get_module_dbname
 	if f is None:
 		raise Exception('get_module_dbname not found')
-	return f('appbase')
+	dbname = f('appbase')
+	if dbname is None:
+		raise Exception('dbname is None model=appbase ')
+	return dbname
 
 async def get_business_date(sor=None):
 	async def _f(sor):