Fix: Fixes Issue #531

@@ -116,6 +116,10 @@ class _MobileScannerState extends State<MobileScanner>
       await Future.delayed(const Duration(seconds: 1, milliseconds: 500));
     }
 
+    _barcodesSubscription ??= _controller.barcodes.listen(
+      widget.onDetect,
+    );
+
     if (!_controller.autoStart) {
       debugPrint(
         'mobile_scanner: not starting automatically because autoStart is set to false in the controller.',
@@ -123,10 +127,6 @@ class _MobileScannerState extends State<MobileScanner>
       return;
     }
 
-    _barcodesSubscription ??= _controller.barcodes.listen(
-      widget.onDetect,
-    );
-
     _controller.start().then((arguments) {
       // ignore: deprecated_member_use_from_same_package
       widget.onStart?.call(arguments);