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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
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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 : 18.0.6
Operating system and version: Debian 9
Apache or nginx version: Apache 2.4.25
PHP version: 7.4.7
The issue you are facing:
My instance was running fine. But I had some issues with phpmyadmin. So i tried sorting them out and ended up with:
Internal Server Error
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.
Is this the first time you’ve seen this error? Y:
Steps to replicate it:
- Try to acces the nextcloud instance
The output of your Nextcloud log in Admin > Logging:
empty :-(
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ochb3x8n33ua',
'passwordsalt' => 'xxxxxxxxxxxxxxxx',
'secret' => 'yyyyyyyyyyyyyyyyy',
'trusted_domains' =>
array (
0 => 'www.mydomain.de',
1 => 'thorin',
2 => '192.168.2.20',
),
'datadirectory' => '/mnt/daten/nextcloud',
'overwrite.cli.url' => 'https://www.mydomain.de',
'dbtype' => 'mysql',
'version' => '18.0.6.0',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_nextadmin',
'dbpassword' => 'xxxxxxxxxxxxxxxxx',
'logtimezone' => 'UTC',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'mail_from_address' => 'my.name',
'mail_smtpmode' => 'smtp',
'mail_domain' => 'mailbox.org',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'PLAIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.mailbox.org',
'mail_smtpport' => '465',
'mail_smtpname' => 'my.name@mailbox.org',
'mail_smtppassword' => 'yyyyyyyyyyyyyyy',
'maintenance' => false,
'theme' => '',
'loglevel' => 0,
'mysql.utf8mb4' => true,
'skeletondirectory' => '',
'updater.release.channel' => 'stable',
'twofactor_enforced' => 'false',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
);
The output of your Apache/nginx/system log in /var/log/____:
nothing with errors
