diff --git a/src/tg_bot.py b/src/tg_bot.py
index a9847d1..ca6b582 100644
--- a/src/tg_bot.py
+++ b/src/tg_bot.py
@@ -535,8 +535,9 @@ def _handle_callback(bot_token: str, cfg: Config, cb: dict):
             "text": "🤖 *AI思考中…*", "parse_mode": "MarkdownV2",
         })
         try:
+            user = find_user_by_chat_id(cfg, chat_id)
             details = expand_promo_detail(
-                cfg.ai, ctx["sender"], ctx["subject"], ctx["original_body"],
+                user.ai, ctx["sender"], ctx["subject"], ctx["original_body"],
             )
         except Exception as e:
             send_text(bot_token, str(chat_id), f"获取详情失败: {e}")