diff --git a/extensions.py b/extensions.py
index 1ffcc22..edc3571 100644
--- a/extensions.py
+++ b/extensions.py
@@ -28,3 +28,4 @@ def format_rating(value: str) -> str | None:
         case "e":
             # Negative Squared Latin Capital Letter E
             return "🅴"
+    return None