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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2):
13.0.6
Operating system and version (eg, Ubuntu 17.04):
FreeBSD 11.2
Apache or nginx version (eg, Apache 2.4.25):
nginx 1.14.0
PHP version (eg, 7.1):
7.2.9
The issue you are facing:
When I try to upload a file (with the desktop client) whose filename contains an apostrophe ' the php-fpm processes start to hang at 100% CPU load until I manually restart the service.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Try to upload this image as
Betty’s Bay, SA 1920x1080.jpg
The output of your Nextcloud log in Admin > Logging:
- nothing revelant in the nextcloud logs
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'something',
'passwordsalt' => 'somethingsomething',
'secret' => 'somethingsomethingsomething',
'trusted_domains' =>
array (
0 => 'something.example.com',
),
'datadirectory' => '/mnt/storagebox/nextclouddata',
'overwrite.cli.url' => 'https://something.example.com',
'dbtype' => 'pgsql',
'version' => '13.0.6.1',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => '',
'memcache.local' => '\\OC\\Memcache\\APCu',
'installed' => true,
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/local/www/nextcloud/apps',
'url' => '/apps',
'writable' => true,
),
1 =>
array (
'path' => '/usr/local/www/nextcloud/apps-pkg',
'url' => '/apps-pkg',
'writable' => false,
),
),
'mail_from_address' => 'something',
'mail_smtpmode' => 'php',
'mail_smtpauthtype' => 'LOGIN',
'mail_domain' => 'example.com',
'theme' => '',
'loglevel' => 2,
'maintenance' => false,
'integrity.check.disabled' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
- nothing useful in php-fpm.log or the nginx logs
I am using the nginx webroot settings from here: Nginx configuration — Nextcloud 13 Administration Manual 13 documentation
I am wondering if this is an issue with my nginx/php-fpm config and not a Nextcloud bug? 
Aside from the usual file size uploading hickups I had no big issues until I tried to upload some files with apostrophe in their names.