spool->msg_status == MSG_INVALID' failed error appears

[romanspotpower]

Hi,
I've get the following error:
nginx: worker process: ../nchan/src/store/spool.c:479: spool_fetch_msg: Assertion `spool->msg_status == MSG_INVALID' failed.
2020/03/25 10:24:49 [alert] 63#63: worker process 72 exited on signal 6

after a hour of streaming.
After restart the error is gone.

My configuration:
Nchan 1.2.7 on Ubuntu 19.04 and NGINX 1.17.7.

nginx.conf file
user www-data;
worker_processes auto;
worker_cpu_affinity auto;
worker_rlimit_nofile 10240;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
use epoll;
multi_accept on;
worker_connections 10000;

    # multi_accept on;

}

http {
upstream redis-storage {
nchan_redis_server redis://10.0.0.37:80;
nchan_redis_namespace nchan_streamer_initial;
nchan_redis_storage_mode backup;
}

    nchan_shared_memory_size 4294967296;

    server{
        listen 8088;

        location = /sub {
            nchan_redis_pass redis-storage;
            nchan_subscriber;
            nchan_channel_id $arg_id;
            nchan_subscriber_first_message -1;
        }

        location = /pub {
            nchan_redis_pass redis-storage;
            nchan_publisher;
            nchan_channel_id $arg_id;
            nchan_message_timeout 0; 
            nchan_message_buffer_length 10;
        }

What could be the issue?

[ivanovv]

seems to be a dupe of #534