diff --git a/lib/src/media_format/audio.dart b/lib/src/media_format/audio.dart
index f92973d..0266bd1 100644
--- a/lib/src/media_format/audio.dart
+++ b/lib/src/media_format/audio.dart
@@ -310,7 +310,7 @@ class Audio {
 
   @override
   String toString() {
-    var desc = 'MediaFormat: ${mediaFormat.name}';
+    var desc = 'MediaFormat: ${mediaFormat?.name ?? "NONE"}';
     if (_onDisk) {
       desc += 'storage: $_storagePath';
     }