Plötzlicher internal server error

<?php
class JConfig {
    public $offline = '0';
    public $offline_message = 'Diese Website ist zurzeit im Wartungsmodus.<br />Bitte später wiederkommen.';
    public $display_offline_message = '1';
    public $offline_image = '';
    public $sitename = 'Freiwillige Feuerwehr Westendorf';
    public $editor = 'tinymce';
    public $captcha = '0';
    public $list_limit = '20';
    public $access = '1';
    public $debug = '0';
    public $debug_lang = '0';
    public $dbtype = 'mysqli';
    public $host = 'localhost';
    public $user = 'xxxxxxx';
    public $password = 'xxxxxxx';
    public $db = 'usrxxxxxxxx';
    public $dbprefix = 'xxxxx_';
    public $live_site = '';
    public $secret = 'xxxxxxxxxx';
    public $gzip = '0';
    public $error_reporting = 'none';
    public $helpurl = 'https://help.joomla.org/proxy?keyref=Help{major}{minor}:{keyref}&lang={langcode}';
    public $ftp_host = '';
    public $ftp_port = '';
    public $ftp_user = '';
    public $ftp_pass = '';
    public $ftp_root = '';
    public $ftp_enable = '0';
    public $offset = 'UTC';
    public $mailonline = '1';
    public $mailer = 'mail';
    public $mailfrom = 'xxxxxxxxxt';
    public $fromname = 'Freiwillige Feuerwehr Westendorf';
    public $sendmail = '/usr/sbin/sendmail';
    public $smtpauth = '0';
    public $smtpuser = '';
    public $smtppass = '';
    public $smtphost = 'localhost';
    public $smtpsecure = 'none';
    public $smtpport = '25';
    public $caching = '0';
    public $cache_handler = 'file';
    public $cachetime = '15';
    public $cache_platformprefix = '0';
    public $MetaDesc = 'Website der FF Westendorf, Freiwillige Feuerwehr Westendorf in Tirol';
    public $MetaKeys = '';
    public $MetaTitle = '1';
    public $MetaAuthor = '1';
    public $MetaVersion = '0';
    public $robots = '';
    public $sef = '1';
    public $sef_rewrite = '0';
    public $sef_suffix = '0';
    public $unicodeslugs = '0';
    public $feed_limit = '10';
    public $feed_email = 'none';
    public $log_path = '/var/www/xxxxx/html/ff/administrator/logs';
    public $tmp_path = '/var/www/xxxxx/html/ff/tmp';
    public $lifetime = '15';
    public $session_handler = 'database';
    public $shared_session = '0';
}

##
# @package    Joomla
# @copyright  Copyright (C) 2005 - 2019 Open Source Matters. All rights reserved.
# @license    GNU General Public License version 2 or later; see LICENSE.txt
##

##
# READ THIS COMPLETELY IF YOU CHOOSE TO USE THIS FILE!
#
# The line 'Options +FollowSymLinks' may cause problems with some server configurations.
# It is required for the use of Apache mod_rewrite, but it may have already been set by 
# your server administrator in a way that disallows changing it in this .htaccess file.
# If using it causes your site to produce an error, comment it out (add # to the
# beginning of the line), reload your site in your browser and test your sef urls. If
# they work, then it has been set by your server administrator and you do not need to
# set it here.
##

## No directory listings
<IfModule autoindex>
  IndexIgnore *
</IfModule>

## Suppress mime type detection in browsers for unknown types
<IfModule mod_headers.c>
Header always set X-Content-Type-Options "nosniff"
</IfModule>

## Can be commented out if causes errors, see notes above.
# Options +FollowSymlinks
# Options -Indexes

## Mod_rewrite in use.

RewriteEngine off

## Begin - Rewrite rules to block out some common exploits.
# If you experience problems on your site then comment out the operations listed
# below by adding a # to the beginning of the line.
# This attempts to block the most common type of exploit `attempts` on Joomla!
#
# Block any script trying to base64_encode data within the URL.
RewriteCond %{QUERY_STRING} base64_encode[^(]*\([^)]*\) [OR]
# Block any script that includes a <script> tag in URL.
RewriteCond %{QUERY_STRING} (<|%3C)([^s]*s)+cript.*(>|%3E) [NC,OR]
# Block any script trying to set a PHP GLOBALS variable via URL.
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
# Block any script trying to modify a _REQUEST variable via URL.
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
# Return 403 Forbidden header and show the content of the root home page
RewriteRule .* index.php [F]
#
## End - Rewrite rules to block out some common exploits.

## Begin - Custom redirects
#
# If you need to redirect some pages, or set a canonical non-www to
# www redirect (or vice versa), place that code here. Ensure those
# redirects use the correct RewriteRule syntax and the [R=301,L] flags.
#
## End - Custom redirects

##
# Uncomment the following line if your webserver's URL
# is not directly related to physical file paths.
# Update Your Joomla! Directory (just / for root).
##

# RewriteBase /

## Begin - Joomla! core SEF Section.
#
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
#
# If the requested path and file is not /index.php and the request
# has not already been internally rewritten to the index.php script
RewriteCond %{REQUEST_URI} !^/index\.php
# and the requested path and file doesn't directly match a physical file
RewriteCond %{REQUEST_FILENAME} !-f
# and the requested path and file doesn't directly match a physical folder
RewriteCond %{REQUEST_FILENAME} !-d
# internally rewrite the request to the index.php script
RewriteRule .* index.php [L]
#
## End - Joomla! core SEF Section.