diff --git a/sdk/python/packages/flet-web/src/flet_web/fastapi/flet_app.py b/sdk/python/packages/flet-web/src/flet_web/fastapi/flet_app.py
index 58f0655974..2c920c5b02 100644
--- a/sdk/python/packages/flet-web/src/flet_web/fastapi/flet_app.py
+++ b/sdk/python/packages/flet-web/src/flet_web/fastapi/flet_app.py
@@ -255,9 +255,13 @@ async def __on_message(self, data: Any):
 
             # try to retrieve existing session
             if req.session_id:
-                self.__session = await app_manager.get_session(
+                candidate = await app_manager.get_session(
                     self.__get_unique_session_id(req.session_id)
                 )
+                if candidate is not None and candidate.connection is None:
+                    self.__session = candidate
+                else:
+                    self.__session = None
 
             oauth_state = None
             if self.__oauth_state_id: