From a0ef6e36110bce5ec28df704b88b5c1e9ca588ba Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Mon, 15 Nov 2021 08:46:01 -0800
Subject: [PATCH] prevent nil response

fix https://github.com/chrislusf/seaweedfs/issues/2452
---
 weed/server/volume_grpc_copy.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 9630b322e..9d9f756ce 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -226,7 +226,7 @@ func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName s
 		if receiveErr == io.EOF {
 			break
 		}
-		if resp.ModifiedTsNs != 0 {
+		if resp!=nil && resp.ModifiedTsNs != 0 {
 			modifiedTsNs = resp.ModifiedTsNs
 		}
 		if receiveErr != nil {