diff --git a/lib/src/qr_code_scanner.dart b/lib/src/qr_code_scanner.dart
index a4d6207..19b90a3 100644
--- a/lib/src/qr_code_scanner.dart
+++ b/lib/src/qr_code_scanner.dart
@@ -156,14 +156,14 @@ class _QRViewState extends State<QRView> {
 
 class _QrCameraSettings {
   _QrCameraSettings({
-    this.cameraFacing,
+    this.cameraFacing = CameraFacing.unknown,
   });
 
-  final CameraFacing? cameraFacing;
+  final CameraFacing cameraFacing;
 
   Map<String, dynamic> toMap() {
     return <String, dynamic>{
-      'cameraFacing': cameraFacing!.index,
+      'cameraFacing': cameraFacing.index,
     };
   }
 }
diff --git a/lib/src/types/camera.dart b/lib/src/types/camera.dart
index 532f3b4..67fe8cb 100644
--- a/lib/src/types/camera.dart
+++ b/lib/src/types/camera.dart
@@ -3,5 +3,8 @@ enum CameraFacing {
   back,
 
   /// Shows front facing camera.
-  front
+  front,
+
+  /// Unknown camera
+  unknown
 }