I'm using TLS between my client and broker, and when sending a lot of messages using QoS 2, the client connection is closed with no explanation. In the server logs, I see this warning: 'tlstran_pipe_qos_send_cb: NULL message detected in send_cb'.
is that bug client side or server side 


tlstran_pipe_qos_send_cb: NULL msg detected in send_cb
This is a GitHub Issue
repo:nanomq
owner:emqx
Title : tlstran_pipe_qos_send_cb: NULL msg detected in send_cb
Issue date:

--- start body ---
I'm using TLS between my client and broker, and when sending a lot of messages using QoS 2, the client connection is closed with no explanation. In the server logs, I see this warning: 'tlstran_pipe_qos_send_cb: NULL message detected in send_cb'.
is that bug client side or server side 


--- end body ---
