diff --git a/python/pipeline/pipeline_server.py b/python/pipeline/pipeline_server.py
index 7ea8858d2b47c1c20226c4f53805f3aa2fd75643..0afa3872a82a3f140b811a3bb3a40f0f7bdd373a 100644
--- a/python/pipeline/pipeline_server.py
+++ b/python/pipeline/pipeline_server.py
@@ -56,7 +56,6 @@ class PipelineServicer(pipeline_service_pb2_grpc.PipelineServiceServicer):
             resp = pipeline_service_pb2.Response()
             resp.err_no = channel.ChannelDataErrcode.NO_SERVICE.value
             resp.err_msg = "Failed to inference: Service name error."
-            resp.result = ""
             return resp
         resp = self._dag_executor.call(request)
         return resp