diff --git a/onamazu/onamazu.py b/onamazu/onamazu.py
index 12330c2..1e0962a 100644
--- a/onamazu/onamazu.py
+++ b/onamazu/onamazu.py
@@ -22,7 +22,7 @@ def __load_config(self):
         self.logger.info(f'config_map={config_map}')
 
         if len(config_map) == 0:
-            raise Exception("No config file found. Please see README.md")
+            self.logger.warning(f"No config files ({config.ConfigFileName}) are found. Please see README.md")
 
         return config_map
 
diff --git a/tests/test_reload_conf.py b/tests/test_reload_conf.py
index 1a61c54..866551b 100644
--- a/tests/test_reload_conf.py
+++ b/tests/test_reload_conf.py
@@ -8,6 +8,15 @@
 from onamazu.watcher import NamazuEvent
 
 
+def test_return_empty_when_no_config_file():
+    o = ONamazu(ct.ROOT_DIR, 60)
+    o.event_handler = MagicMock(name="event_handler")
+    o.click()
+    o.stop()
+
+    o.event_handler.assert_not_called()
+
+
 class TestReload:
     def test_reload_on_create(self):
         ct.place_config_file("", {"pattern": "*.csv"})