XF 2.1 MySQL Gone Away on Addon Create (cmd.php) - RESOLVED

[HappyWorld]

[xxx@xxx xf2]# php cmd.php xf-addon:create
Enter an ID for this add-on: xxxxxxxxxx
[E_WARNING] Error while sending STMT_PREPARE packet. PID=188820
Enter an ID for this add-on: xxxxxxxxxx
please_enter_valid_add_on_id_using_rules
Enter an ID for this add-on: xxxxxxxxxx
MySQL statement prepare error [2006]: MySQL server has gone away

What to check?
Browsing using normal browser (admin page, forum page, etc) are all fine.

Strange, after restarting httpd in server, it works