diff --git a/astrbot/core/platform/sources/wechatpadpro/wechatpadpro_adapter.py b/astrbot/core/platform/sources/wechatpadpro/wechatpadpro_adapter.py
index cc8d8709c..ce47a6743 100644
--- a/astrbot/core/platform/sources/wechatpadpro/wechatpadpro_adapter.py
+++ b/astrbot/core/platform/sources/wechatpadpro/wechatpadpro_adapter.py
@@ -501,7 +501,7 @@ class WeChatPadProAdapter(Platform):
 
             # 对于群聊，session_id 可以是群聊 ID 或发送者 ID + 群聊 ID (如果 unique_session 为 True)
             if self.unique_session:
-                abm.session_id = f"{from_user_name}_{to_user_name}"
+                abm.session_id = f"{from_user_name}_{abm.sender.user_id}"
             else:
                 abm.session_id = from_user_name