diff --git a/astrbot/core/platform/astr_message_event.py b/astrbot/core/platform/astr_message_event.py
index 6402aeaed..7818efbe5 100644
--- a/astrbot/core/platform/astr_message_event.py
+++ b/astrbot/core/platform/astr_message_event.py
@@ -1,5 +1,6 @@
 import abc
 import asyncio
+import copy
 import hashlib
 import re
 import uuid
@@ -29,6 +30,9 @@
 
 
 class AstrMessageEvent(abc.ABC):
+    # extras 中可安全清理的瞬态字段清单；子类可按需扩展
+    TRANSIENT_EXTRA_KEYS: set[str] = set()
+
     def __init__(
         self,
         message_str: str,
@@ -71,6 +75,8 @@ def __init__(
 
         # back_compability
         self.platform = platform_meta
+        # 可选的绕过标记，避免被 SessionWaiter 再次截获
+        self._bypass_session_waiter = False
 
     def get_platform_name(self):
         """获取这个事件所属的平台的类型（如 aiocqhttp, slack, discord 等）。
@@ -278,6 +284,22 @@ def clear_result(self):
         """清除消息事件的结果。"""
         self._result = None
 
+    def clone_for_llm(self) -> "AstrMessageEvent":
+        """浅拷贝并重置状态，以便重新走默认 LLM 流程。"""
+        new_event: AstrMessageEvent = copy.copy(self)
+        new_event.clear_result()
+        # 保留非瞬态 extras，避免跨管线上下文丢失
+        new_event._extras = self._extras.copy()
+        for key in self.TRANSIENT_EXTRA_KEYS:
+            new_event._extras.pop(key, None)
+        new_event._has_send_oper = False
+        new_event.call_llm = False
+        new_event.is_wake = False
+        new_event.is_at_or_wake_command = False
+        new_event.plugins_name = None
+        new_event._bypass_session_waiter = False
+        return new_event
+
     """消息链相关"""
 
     def make_result(self) -> MessageEventResult:
diff --git a/astrbot/core/utils/session_waiter.py b/astrbot/core/utils/session_waiter.py
index 33b7cb17a..c42a81ffb 100644
--- a/astrbot/core/utils/session_waiter.py
+++ b/astrbot/core/utils/session_waiter.py
@@ -9,6 +9,7 @@
 from typing import Any
 
 import astrbot.core.message.components as Comp
+from astrbot import logger
 from astrbot.core.platform import AstrMessageEvent
 
 USER_SESSIONS: dict[str, "SessionWaiter"] = {}  # 存储 SessionWaiter 实例
@@ -29,6 +30,33 @@ def __init__(self):
 
         self.history_chains: list[list[Comp.BaseMessageComponent]] = []
 
+    def fallback_to_llm(
+        self,
+        event_queue: asyncio.Queue,
+        event: AstrMessageEvent,
+        *,
+        stop_session: bool = True,
+    ) -> AstrMessageEvent:
+        """将当前事件重新入队，由默认 LLM 流程处理，适用于非预期输入的兜底。
+
+        Args:
+            event_queue: 事件队列
+            event: 当前事件
+            stop_session: 是否结束当前 SessionWaiter。False 时仅兜底当前输入，继续等待后续输入。
+        """
+        if not stop_session:
+            logger.warning(
+                "fallback_to_llm(stop_session=False) 会保留当前会话，默认会话拦截可能导致兜底无效，"
+                "建议谨慎使用或在后续输入中自行终止会话。",
+            )
+        new_event = event.clone_for_llm()
+        new_event._bypass_session_waiter = not stop_session
+        event_queue.put_nowait(new_event)
+        event.stop_event()
+        if stop_session:
+            self.stop()
+        return new_event
+
     def stop(self, error: Exception = None):
         """立即结束这个会话"""
         if not self.future.done():
@@ -147,11 +175,15 @@ def _cleanup(self, error: Exception = None):
         self.session_controller.stop(error)
 
     @classmethod
-    async def trigger(cls, session_id: str, event: AstrMessageEvent):
-        """外部输入触发会话处理"""
+    async def trigger(cls, session_id: str, event: AstrMessageEvent) -> bool:
+        """外部输入触发会话处理
+
+        Returns:
+            bool: 是否成功触发处理。False 表示会话不存在或已结束。
+        """
         session = USER_SESSIONS.get(session_id)
         if not session or session.session_controller.future.done():
-            return
+            return False
 
         async with session._lock:
             if not session.session_controller.future.done():
@@ -164,6 +196,8 @@ async def trigger(cls, session_id: str, event: AstrMessageEvent):
                     await session.handler(session.session_controller, event)
                 except Exception as e:
                     session.session_controller.stop(e)
+                return True
+        return False
 
 
 def session_waiter(timeout: int = 30, record_history_chains: bool = False):
diff --git a/packages/session_controller/main.py b/packages/session_controller/main.py
index 4d4a42528..038118c2e 100644
--- a/packages/session_controller/main.py
+++ b/packages/session_controller/main.py
@@ -1,4 +1,3 @@
-import copy
 from sys import maxsize
 
 import astrbot.api.message_components as Comp
@@ -7,7 +6,6 @@
 from astrbot.api.star import Context, Star
 from astrbot.core.utils.session_waiter import (
     FILTERS,
-    USER_SESSIONS,
     SessionController,
     SessionWaiter,
     session_waiter,
@@ -23,10 +21,12 @@ def __init__(self, context: Context):
     @filter.event_message_type(filter.EventMessageType.ALL, priority=maxsize)
     async def handle_session_control_agent(self, event: AstrMessageEvent):
         """会话控制代理"""
+        if getattr(event, "_bypass_session_waiter", False):
+            return
         for session_filter in FILTERS:
             session_id = session_filter.filter(event)
-            if session_id in USER_SESSIONS:
-                await SessionWaiter.trigger(session_id, event)
+            handled = await SessionWaiter.trigger(session_id, event)
+            if handled:
                 event.stop_event()
 
     @filter.event_message_type(filter.EventMessageType.ALL, priority=maxsize - 1)
@@ -96,11 +96,10 @@ async def empty_mention_waiter(
                             0,
                             Comp.At(qq=event.get_self_id(), name=event.get_self_id()),
                         )
-                        new_event = copy.copy(event)
-                        # 重新推入事件队列
-                        self.context.get_event_queue().put_nowait(new_event)
-                        event.stop_event()
-                        controller.stop()
+                        controller.fallback_to_llm(
+                            self.context.get_event_queue(),
+                            event,
+                        )
 
                     try:
                         await empty_mention_waiter(event)