Update app.py

app.py

@@ -122,8 +122,8 @@ async def handle_action(request: Request):
                 target_player["coins"] -= coins_to_steal
                 challenger["coins"] += coins_to_steal
                 game["challenge"]["status"] = 'choose'
-                game["challenge"]["challenger"] = target_player
-                game["challenge"]["target"] = challenger
+                game["challenge"]["challenger"] = target_player['name']
+                game["challenge"]["target"] = challenger['name']
                 return {"success": True, "message": f"Challenge failed. {target_player['name']} loses {coins_to_steal} coins to {challenger['name']}."}
             else:
                 game["challenge"]["status"] = 'choose'