生成PHP空会话文件

I have a site where I use session authorization for my users Details are:

PHP Version 7.2.8
session.gc_maxlifetime  604800
session.gc_probability  1
session.gc_divisor  1000

I use the following db.php file for creating a session

$dinamo_session = session_name("dinamo_session");
ini_set('session.cookie_domain', '.DOMAIN_NAME'); 

#if (isset($_REQUEST[session_name("dinamo_session")])) {
    #ini_set('session.cookie_lifetime', 604800);
    #ini_set('session.gc-maxlifetime', 604800);
    #ini_set('session.save_path', '/var/www/user9357/data/_SESSIONS');
    session_start();
    #session_regenerate_id(true);
    #session_write_close();
#}

My users do not complain from their end everything seems to be ok, the only thing is that I see a growing amount of session files with zero sizes (as well as I see normal session files with the real session's data) You can see different lines of code are commented out. I tried to use all of them to avoid creation of these zero size files but that did not help (isset - to check if the session has been created before, session_regenerate_id(true) - to delete the old files) but no luck. I even had to comment out isset as some users complained that they were not able to log in. I also checked that: Opera and Firefox were ok, but Vivaldi browser was not able to login

Any ideas why these zero files are created and how can I stop it?