Increase a bit the robustness of mat2

Those issues were found via https://github.com/google/atheris

1 files changed, 2 insertions, 1 deletions

diff --git a/libmat2/audio.py b/libmat2/audio.py
index bd7add9..3f3a757 100644
--- a/libmat2/audio.py
+++ b/libmat2/audio.py
@@ -13,7 +13,8 @@ class MutagenParser(abstract.AbstractParser):
     def __init__(self, filename):
         super().__init__(filename)
         try:
-            mutagen.File(self.filename)
+            if mutagen.File(self.filename) is None:
+                raise ValueError
         except mutagen.MutagenError:
             raise ValueError