diff --git a/weed/server/filer_grpc_server_kv.go b/weed/server/filer_grpc_server_kv.go
index 26a616c18..be90b2014 100644
--- a/weed/server/filer_grpc_server_kv.go
+++ b/weed/server/filer_grpc_server_kv.go
@@ -30,6 +30,7 @@ func (fs *FilerServer) KvPut(ctx context.Context, req *filer_pb.KvPutRequest) (*
 		if err := fs.filer.Store.KvDelete(ctx, req.Key); err != nil {
 			return &filer_pb.KvPutResponse{Error: err.Error()}, nil
 		}
+		return &filer_pb.KvPutResponse{}, nil
 	}
 
 	err := fs.filer.Store.KvPut(ctx, req.Key, req.Value)