diff --git a/mopidy/utils/settings.py b/mopidy/utils/settings.py
index 4de7d1cf..34126907 100644
--- a/mopidy/utils/settings.py
+++ b/mopidy/utils/settings.py
@@ -199,6 +199,9 @@ def mask_value_if_secret(key, value):
 
 def did_you_mean(setting, defaults):
     """Suggest most likely setting based on levenshtein."""
+    if not defaults:
+        return None
+
     candidates = [(levenshtein(setting, d), d) for d in defaults]
     candidates.sort()
 
diff --git a/tests/utils/settings_test.py b/tests/utils/settings_test.py
index 55e1156b..c129b9b5 100644
--- a/tests/utils/settings_test.py
+++ b/tests/utils/settings_test.py
@@ -23,7 +23,7 @@ class ValidateSettingsTest(unittest.TestCase):
         result = validate_settings(self.defaults,
             {'MPD_SERVER_HOSTNMAE': '127.0.0.1'})
         self.assertEqual(result['MPD_SERVER_HOSTNMAE'],
-            u'Unknown setting. Is it misspelled?')
+            u'Unknown setting. Did you mean MPD_SERVER_HOSTNAME?')
 
     def test_not_renamed_setting_returns_error(self):
         result = validate_settings(self.defaults,