diff --git a/clients/python/fdclient/client.py b/clients/python/fdclient/client.py
index 6b1b18a..c6abfdc 100644
--- a/clients/python/fdclient/client.py
+++ b/clients/python/fdclient/client.py
@@ -26,6 +26,7 @@ def __init__(self, server_url, request_timeout, compression=True):
         self.local_storage = threading.local()
         self.requests_session = requests.Session()
         self.compression = compression if zstandard is not None else False
+        self.input_type = None
         self._set_input_type()
             
         self.request_timeout = request_timeout