diff --git a/lib/utils/ev_from_bytes.dart b/lib/utils/ev_from_bytes.dart
index da81831..c7c7b63 100644
--- a/lib/utils/ev_from_bytes.dart
+++ b/lib/utils/ev_from_bytes.dart
@@ -1,7 +1,7 @@
 import 'dart:math' as math;
-import 'dart:typed_data';
 
 import 'package:exif/exif.dart';
+import 'package:flutter/foundation.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
 Future<double> evFromImage(Uint8List bytes) async {
@@ -10,7 +10,7 @@ Future<double> evFromImage(Uint8List bytes) async {
   final apertureValueRatio = (tags["EXIF FNumber"]?.values as IfdRatios?)?.ratios.first;
   final speedValueRatio = (tags["EXIF ExposureTime"]?.values as IfdRatios?)?.ratios.first;
   if (iso == null || apertureValueRatio == null || speedValueRatio == null) {
-    throw 'Error parsing EXIF: ${tags.keys}';
+    throw FlutterError('Error parsing EXIF: ${tags.keys}');
   }
 
   final aperture = apertureValueRatio.numerator / apertureValueRatio.denominator;
diff --git a/test/utils/ev_from_bytes_test.dart b/test/utils/ev_from_bytes_test.dart
index f73a257..635bb3c 100644
--- a/test/utils/ev_from_bytes_test.dart
+++ b/test/utils/ev_from_bytes_test.dart
@@ -17,7 +17,7 @@ void main() {
       'no EXIF',
       () {
         final bytes = File('assets/launcher_icon_dev_512.png').readAsBytesSync();
-        expectLater(evFromImage(bytes), completion(null));
+        expectLater(evFromImage(bytes), throwsFlutterError);
       },
     );
   });