diff --git a/libmat2/audio.py b/libmat2/audio.py
index 3f3a757..09e1146 100644
--- a/libmat2/audio.py
+++ b/libmat2/audio.py
@@ -21,7 +21,7 @@ class MutagenParser(abstract.AbstractParser):
     def get_meta(self) -> Dict[str, Union[str, dict]]:
         f = mutagen.File(self.filename)
         if f.tags:
-            return {k:', '.join(v) for k, v in f.tags.items()}
+            return {k:', '.join(map(str, v)) for k, v in f.tags.items()}
         return {}
 
     def remove_all(self) -> bool: