diff --git a/flask_shell2http/classes.py b/flask_shell2http/classes.py
index 9d36674..06bd640 100644
--- a/flask_shell2http/classes.py
+++ b/flask_shell2http/classes.py
@@ -99,7 +99,7 @@ def cleanup_temp_dir(self, future: Future) -> None:
         key: Optional[str] = future.result().get("key", None)
         if not key:
             return None
-        tmpdir: Optional[str] = self.__tmpdirs.get(key, None)
+        tmpdir: Optional[str] = self.__tmpdirs.get(key)
         if not tmpdir:
             return None