diff --git a/apps/api/app/api/routes/gpu_lipsync.py b/apps/api/app/api/routes/gpu_lipsync.py
index db3a83821..da1b8385f 100644
--- a/apps/api/app/api/routes/gpu_lipsync.py
+++ b/apps/api/app/api/routes/gpu_lipsync.py
@@ -184,13 +184,16 @@ async def report_result(
         pass
     # 其他情况：success=true 且无文件 → Worker 已自行 PUT 到预签名 URL，直接标记完成
 
-    task = svc.report_result(
-        task_id=task_id,
-        worker_id=worker_id,
-        success=success,
-        duration_seconds=duration_seconds,
-        error_msg=error_msg,
-    )
+    try:
+        task = svc.report_result(
+            task_id=task_id,
+            worker_id=worker_id,
+            success=success,
+            duration_seconds=duration_seconds,
+            error_msg=error_msg,
+        )
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail=str(exc)) from exc
     return GpuLipsyncResultResponse(
         ok=True,
         task_id=task.id,