bug: fixe

@@ -16,8 +16,7 @@ class _BarcodeScannerWithControllerState
   String? barcode;
 
   MobileScannerController controller = MobileScannerController(
-    torchEnabled: true,
-    // formats: [BarcodeFormat.qrCode]
+      torchEnabled: true, formats: [BarcodeFormat.qrCode]
       // facing: CameraFacing.front,
       );
 

@@ -178,8 +178,10 @@ public class SwiftMobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
             formatList.add(BarcodeFormat(rawValue: index))
         }
         
+        if (formatList.count != 0) {
             let barcodeOptions = BarcodeScannerOptions(formats: formatList.firstObject as! BarcodeFormat)
             scanner = BarcodeScanner.barcodeScanner(options: barcodeOptions)
+        }
         
         // Set the camera to use
         position = facing == 0 ? AVCaptureDevice.Position.front : .back