diff --git a/lib/flutter_statusbar_manager.dart b/lib/flutter_statusbar_manager.dart
index e9a3e12..d32c1d2 100644
--- a/lib/flutter_statusbar_manager.dart
+++ b/lib/flutter_statusbar_manager.dart
@@ -9,7 +9,7 @@ class _StatusBarStyle {
   static const String LIGHT_CONTENT = "light-content";
   static const String DARK_CONTENT = "dark-content";
 
-  static String getStyle(StatusBarStyle? style) {
+  static String getStyle(StatusBarStyle style) {
     switch (style) {
       case StatusBarStyle.DEFAULT:
         return DEFAULT;
@@ -17,8 +17,6 @@ class _StatusBarStyle {
         return DARK_CONTENT;
       case StatusBarStyle.LIGHT_CONTENT:
         return LIGHT_CONTENT;
-      default:
-        return DEFAULT;
     }
   }
 }
@@ -30,7 +28,7 @@ class _StatusBarAnimation {
   static const String FADE = "fade";
   static const String SLIDE = "slide";
 
-  static String getAnimation(StatusBarAnimation? animation) {
+  static String getAnimation(StatusBarAnimation animation) {
     switch (animation) {
       case StatusBarAnimation.NONE:
         return NONE;
@@ -38,8 +36,6 @@ class _StatusBarAnimation {
         return FADE;
       case StatusBarAnimation.SLIDE:
         return SLIDE;
-      default:
-        return NONE;
     }
   }
 }
@@ -51,7 +47,7 @@ class _NavigationBarStyle {
   static const String DARK = "light";
   static const String LIGHT = "dark";
 
-  static String getStyle(NavigationBarStyle? style) {
+  static String getStyle(NavigationBarStyle style) {
     switch (style) {
       case NavigationBarStyle.DEFAULT:
         return DEFAULT;
@@ -59,8 +55,6 @@ class _NavigationBarStyle {
         return DARK;
       case NavigationBarStyle.LIGHT:
         return LIGHT;
-      default:
-        return DEFAULT;
     }
   }
 }