short description

/var/log/ispconfig/httpd/site/error.log.1.gz are never rotated.

environment

Server OS: debian/buntu
Server OS version: jessie/xenial
ISPConfig version: 3.1.12

Server version: Apache/2.4.10 (Debian)
Server built:   Mar 31 2018 09:39:03

nginx version: nginx/1.10.3 (Ubuntu)

PHP 5.6.33-0+deb8u1 (cli) (built: Jan  5 2018 15:46:26)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with XCache v3.2.0, Copyright (c) 2005-2014, by mOo
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with XCache Optimizer v3.2.0, Copyright (c) 2005-2014, by mOo
    with XCache Cacher v3.2.0, Copyright (c) 2005-2014, by mOo
    with XCache Coverager v3.2.0, Copyright (c) 2005-2014, by mOo

PHP 7.0.30-0ubuntu0.16.04.1 (cli) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.30-0ubuntu0.16.04.1, Copyright (c) 1999-2017, by Zend Technologies

proposed fix

			while($num >= 1) {
				if (is_file($error_logfile . '.' . $num . '.gz')) rename($error_logfile . '.' . $num . '.gz', $error_logfile . '.' . ($num + 1) . '.gz');
				$num--;
			}