diff --git a/modules/sub_agent/manager.py b/modules/sub_agent/manager.py
index 865912c..082d8ed 100644
--- a/modules/sub_agent/manager.py
+++ b/modules/sub_agent/manager.py
@@ -264,11 +264,16 @@ class SubAgentManager(SubAgentStateMixin, SubAgentStatsMixin, SubAgentCreationMi
             return {"success": False, "status": task.get("status"), "message": "子智能体已结束。"}
 
         real_task_id = task["task_id"]
-        running_task = self._running_tasks.get(real_task_id)
         deadline = time.time() + (timeout_seconds or task.get("timeout_seconds") or SUB_AGENT_DEFAULT_TIMEOUT)
 
         while time.time() < deadline:
             self.reconcile_task_states()
+            # 关键：其他线程（如前端轮询 /api/sub_agents）可能调用 _load_state()
+            # 并替换 self.tasks 字典，导致旧 task 引用失效。每次循环重新获取引用。
+            task = self.tasks.get(real_task_id)
+            if not task:
+                return {"success": False, "error": "未找到对应的子智能体任务"}
+            running_task = self._running_tasks.get(real_task_id)
             status = task.get("status")
 
             # 已到达终态：返回最终结果（持续 reconcile 直到 final_result 就绪）
@@ -278,6 +283,7 @@ class SubAgentManager(SubAgentStateMixin, SubAgentStatsMixin, SubAgentCreationMi
                 # 终态但 final_result 尚未写入，短暂等待后重试
                 time.sleep(SUB_AGENT_STATUS_POLL_INTERVAL)
                 self.reconcile_task_states()
+                task = self.tasks.get(real_task_id) or task
                 if task.get("final_result"):
                     return task["final_result"]
                 return {"success": False, "status": status, "message": "子智能体已结束，但未获取到结果。"}
@@ -285,6 +291,7 @@ class SubAgentManager(SubAgentStateMixin, SubAgentStatsMixin, SubAgentCreationMi
             # asyncio Task 已结束但状态可能还没同步：等待 final_result 就绪
             if running_task and running_task.done():
                 self.reconcile_task_states()
+                task = self.tasks.get(real_task_id) or task
                 if task.get("final_result"):
                     return task["final_result"]
                 # 结果尚未落盘，继续轮询，避免把「已创建」误判为失败