diff --git a/lib/helpers/preferences_helper.dart b/lib/helpers/preferences_helper.dart
index 62e08f7..a2bad80 100644
--- a/lib/helpers/preferences_helper.dart
+++ b/lib/helpers/preferences_helper.dart
@@ -74,8 +74,7 @@ class PreferencesHelper {
 
   /// Get all settings as an [ApplicationPreferences] object
   ApplicationPreferences get preferences => ApplicationPreferences(
-        enableDarkMode:
-            getBool(PreferencesKeyList.ENABLE_DARK_THEME, alternative: null),
+        enableDarkMode: getBool(PreferencesKeyList.ENABLE_DARK_THEME),
       );
 }
 
diff --git a/lib/models/application_preferences.dart b/lib/models/application_preferences.dart
index 36f221e..151d9ac 100644
--- a/lib/models/application_preferences.dart
+++ b/lib/models/application_preferences.dart
@@ -9,5 +9,5 @@ class ApplicationPreferences {
 
   const ApplicationPreferences({
     @required this.enableDarkMode,
-  });
+  }) : assert(enableDarkMode != null);
 }