diff --git a/extensions.py b/extensions.py
index baca79d..28562c0 100644
--- a/extensions.py
+++ b/extensions.py
@@ -32,6 +32,7 @@ def format_rating(value: str) -> str | None:
         case "e":
             # Negative Squared Latin Capital Letter E
             return "🅴"
+    return None
 
 
 def format_status(data) -> str: