diff --git a/examples/game/app.py b/examples/game/app.py
index 7a166390c..95033ed2f 100644
--- a/examples/game/app.py
+++ b/examples/game/app.py
@@ -104,6 +104,7 @@ def get_chat(uid) -> List[List]:
 
 
 def fn_choice(data: gr.EventData, uid):
+    uid = check_uuid(uid)
     send_player_input(data._data["value"], uid=uid)