| diff --git a/src/brpc/socket.cpp b/src/brpc/socket.cpp |
| index e3878c1..75c5b98 100644 |
| --- a/src/brpc/socket.cpp |
| +++ b/src/brpc/socket.cpp |
| @@ -1451,7 +1451,9 @@ void Socket::CheckConnectedAndKeepWrite(int fd, int err, void* data) { |
| butil::fd_guard sockfd(fd); |
| WriteRequest* req = static_cast<WriteRequest*>(data); |
| Socket* s = req->socket; |
| - CHECK_GE(sockfd, 0); |
| + if (err == 0) { |
| + CHECK_GE(sockfd, 0); |
| + } |
| if (err == 0 && s->CheckConnected(sockfd) == 0 |
| && s->ResetFileDescriptor(sockfd) == 0) { |
| if (s->_app_connect) { |
