stop_daemon command does not work.

[busker1004]

Hi. I'm testing json rpc commands. (on CentOS 7.5 1804, Newton version 3.5.0)

The problem is if I send stop_daemon, The 'status' value is printed as unreadable characters. (also daemon does not end)

Below are command and result what I tested.

command)
curl -X POST http://127.0.0.1:21236/stop_daemon

result)
{"status":"▒"}

Is there another command or way to stop daemon? (not 'kill' command)