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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, 18.0.2): 20.0.4
Operating system and version (eg, Ubuntu 20.04): FreeBSD 11.3-RELEASE-p11
Apache or nginx version (eg, Apache 2.4.25): nginx/1.18.0
PHP version (eg, 7.1): PHP 7.3.25
The issue you are facing:
After Enabling MySQL 4-byte support and running sudo -u www php occ maintenance:repair
I now have Segmentation fault (core dumped) everytime I run a php occ command.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
Level
App Message Time
Error PHP Error: Undefined offset: 0 at /usr/local/www/owncloud/apps/serverinfo/lib/OperatingSystems/FreeBSD.php#187 2020-12-18T15:35:51-0500
Error PHP Error: Undefined offset: 0 at /usr/local/www/owncloud/apps/serverinfo/lib/OperatingSystems/FreeBSD.php#187 2020-12-18T15:35:51-0500
Error PHP Error: Undefined offset: 0 at /usr/local/www/owncloud/apps/serverinfo/lib/OperatingSystems/FreeBSD.php#187 2020-12-18T15:35:51-0500
Error PHP Error: Undefined offset: 0 at /usr/local/www/owncloud/apps/serverinfo/lib/OperatingSystems/FreeBSD.php#187 2020-12-18T15:35:51-0500
Error PHP Error: Undefined offset: 0 at /usr/local/www/owncloud/apps/serverinfo/lib/OperatingSystems/FreeBSD.php#155 2020-12-18T15:35:51-0500
Fatal webdav Sabre\DAV\Exception\ServiceUnavailable: Système en mode maintenance. 2020-12-18T15:33:54-0500
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'updater.secret' => 'secret',
'updatechecker' => false,
'instanceid' => 'id',
'passwordsalt' => 'salt',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'do.do.main',
),
'datadirectory' => '/Data',
'overwrite.cli.url' => 'https://do.do.main',
'dbtype' => 'mysql',
'version' => '20.0.4.0',
'dbname' => 'owncloud',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'owncloud',
'dbpassword' => 'dbp',
'logtimezone' => 'UTC',
'installed' => true,
'maintenance' => false,
'loglevel' => 2,
'appstore.experimental.enabled' => true,
'theme' => '',
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'mysql.utf8mb4' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE