diff --git a/music_kraken/connection/connection.py b/music_kraken/connection/connection.py
index 8216c56..d15aa32 100644
--- a/music_kraken/connection/connection.py
+++ b/music_kraken/connection/connection.py
@@ -194,7 +194,7 @@ class Connection:
                     additional_info = cached.attribute.additional_info
 
                     body = cached.content
-                    if "encoding" in additional_info:
+                    if additional_info.get("encoding", None) is not None:
                         body = body.decode(additional_info["encoding"])
 
                     resp.add(
diff --git a/music_kraken/objects/artwork.py b/music_kraken/objects/artwork.py
index 096f242..43ea87e 100644
--- a/music_kraken/objects/artwork.py
+++ b/music_kraken/objects/artwork.py
@@ -51,7 +51,7 @@ class Artwork:
         return min(self._variant_mapping.values(), key=lambda x: x["deviation"])
 
     def get_variant_name(self, variant: ArtworkVariant) -> str:
-        return f"artwork_{variant['width']}x{variant['height']}_{hash_url(variant['url'])}"
+        return f"artwork_{variant['width']}x{variant['height']}_{hash_url(variant['url']).replace('/', '_')}"
 
     def __merge__(self, other: Artwork, override: bool = False) -> None:
         for key, value in other._variant_mapping.items():