Update app.py

app.py

@@ -121,7 +121,7 @@ async def handle_action(request: Request):
                 coins_to_steal = min(target_player["coins"], 2)
                 target_player["coins"] -= coins_to_steal
                 challenger["coins"] += coins_to_steal
-                game["challenge"] = None
+                game["challenge"]["status"] = 'choose'
                 return {"success": True, "message": f"Challenge failed. {target_player['name']} loses {coins_to_steal} coins to {challenger['name']}."}
             else:
                 game["challenge"]["status"] = 'choose'