/tmp directory filling up fast

I have one site where the /var/www/clients/client1/web6/tmp directory is filling up fast, every few seconds a file is created, after a few days this directory was almost 4G, the only way I could remove them was to run ls -1 | xargs rm -rf from within the directory, but they are coming back fast, is this normal? will the system remove them eventually?

 

Thanks, I am on 3.1.15p3 is there a newer version?

 

https://git.ispconfig.org/ispconfig/ispconfig3/issues/5510
3.1.16

Or fix it yourself until its released:

Code:

nano /usr/local/ispconfig/server/lib/classes/cron.d/200-logfiles.inc.php
#find and change:
#exec("cd ?; find . -mtime +1 -name 'sess_*' | grep -v -w .no_delete | xargs rm > /dev/null 2> /dev/null", $tmp_path);
#to:
$app->system->exec_safe("cd ?; find . -mtime +1 -name 'sess_*' | grep -v -w .no_delete | xargs rm > /dev/null 2> /dev/null", $tmp_path);

 

Thank you sir