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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:
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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: 22.1.1
Operating system and version: Debian 9.12
Apache or nginx version: 2.4.25
PHP version (eg, 7.4): 7.4.6
The issue you are facing:
Unable to login via Chrome or Firefox on both Windows & MacOS
Is this the first time you’ve seen this error? Y
The output of your Nextcloud log in Admin > Logging:
Error index TypeError: Argument 1 passed to OC\Group\Manager::getUserIdGroupIds() must be of the type string, null given, called in /var/www/html/cloud/nextcloud/lib/private/Group/Manager.php on line 316
/var/www/html/cloud/nextcloud/lib/private/Group/Manager.php - line 316:
OC\Group\Manager->getUserIdGroupIds()
/var/www/html/cloud/nextcloud/apps/deck/lib/Service/PermissionService.php - line 316:
OC\Group\Manager->isInGroup()
/var/www/html/cloud/nextcloud/apps/deck/lib/Capabilities.php - line 53:
OCA\Deck\Service\PermissionService->canCreate()
/var/www/html/cloud/nextcloud/lib/private/CapabilitiesManager.php - line 69:
OCA\Deck\Capabilities->getCapabilities()
/var/www/html/cloud/nextcloud/lib/private/Template/JSConfigHelper.php - line 190:
OC\CapabilitiesManager->getCapabilities()
/var/www/html/cloud/nextcloud/lib/private/TemplateLayout.php - line 220:
OC\Template\JSConfigHelper->getConfig()
/var/www/html/cloud/nextcloud/lib/private/legacy/OC_Template.php - line 182:
OC\TemplateLayout->__construct()
/var/www/html/cloud/nextcloud/lib/public/AppFramework/Http/TemplateResponse.php - line 204:
OC_Template->fetchPage()
/var/www/html/cloud/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 171:
OCP\AppFramework\Http\TemplateResponse->render()
/var/www/html/cloud/nextcloud/lib/private/AppFramework/App.php - line 156:
OC\AppFramework\Http\Dispatcher->dispatch()
/var/www/html/cloud/nextcloud/lib/private/Route/Router.php - line 301:
OC\AppFramework\App::main()
/var/www/html/cloud/nextcloud/lib/base.php - line 1000:
OC\Route\Router->match()
/var/www/html/cloud/nextcloud/index.php - line 36:
OC::handleRequest()
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
root@XXXXXXX:/var/www/html/cloud/nextcloud/config# cat config.php
<?php
$CONFIG = array (
'instanceid' => 'oc1vr8s47dkv',
'passwordsalt' => 'XXXXXXXXXX',
'secret' => 'XXXXXXXXXX',
'trusted_domains' =>
array (
0 => 'cloud.example.com',
1 => '192.168.1.100',
),
'datadirectory' => '/var/www/html/cloud/nextcloud/data',
'dbtype' => 'mysql',
'version' => '22.1.1.2',
'overwrite.cli.url' => 'https://cloud.example.com/cloud/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'XXXXXXX',
'dbpassword' => 'XXXXXXX',
'installed' => true,
'mail_smtpmode' => 'sendmail',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'jay',
'mail_domain' => 'cloud.example.com',
'mail_smtphost' => 'smtp.localhost',
'mail_smtpport' => '25',
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'has_rebuilt_cache' => true,
'theme' => '',
'loglevel' => 1,
'updater.release.channel' => 'stable',
'mysql.utf8mb4' => true,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'encryption.legacy_format_support' => false,
'encryption.key_storage_migrated' => false,
'app_install_overwrite' =>
array (
0 => 'cookbook',
1 => 'dicomviewer',
2 => 'emlviewer',
),
);
The output of your Apache/nginx/system log in /var/log/____:
{"reqId":"ethy7rah1PV0v55jjA6z","level":3,"time":"2021-09-04T20:39:13+00:00","remoteAddr":"192.168.1.10","user":"--","app":"index","method":"GET","url":"/cloud/nextcloud/index.php/login?redirect_url=/cloud/nextcloud/index.php/apps/files/?dir%3D/%26fileid%3D6","message":"Argument 1 passed to OC\\Group\\Manager::getUserIdGroupIds() must be of the type string, null given, called in /var/www/html/cloud/nextcloud/lib/private/Group/Manager.php on line 316","userAgent":"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36","version":"22.1.1.2","exception":{"Exception":"TypeError","Message":"Argument 1 passed to OC\\Group\\Manager::getUserIdGroupIds() must be of the type string, null given, called in /var/www/html/cloud/nextcloud/lib/private/Group/Manager.php on line 316","Code":0,"Trace":[{"file":"/var/www/html/cloud/nextcloud/lib/private/Group/Manager.php","line":316,"function":"getUserIdGroupIds","class":"OC\\Group\\Manager","type":"->"},{"file":"/var/www/html/cloud/nextcloud/apps/deck/lib/Service/PermissionService.php","line":316,"function":"isInGroup","class":"OC\\Group\\Manager","type":"->"},{"file":"/var/www/html/cloud/nextcloud/apps/deck/lib/Capabilities.php","line":53,"function":"canCreate","class":"OCA\\Deck\\Service\\PermissionService","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/CapabilitiesManager.php","line":69,"function":"getCapabilities","class":"OCA\\Deck\\Capabilities","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/Template/JSConfigHelper.php","line":190,"function":"getCapabilities","class":"OC\\CapabilitiesManager","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/TemplateLayout.php","line":220,"function":"getConfig","class":"OC\\Template\\JSConfigHelper","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/legacy/OC_Template.php","line":182,"function":"__construct","class":"OC\\TemplateLayout","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/public/AppFramework/Http/TemplateResponse.php","line":204,"function":"fetchPage","class":"OC_Template","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":171,"function":"render","class":"OCP\\AppFramework\\Http\\TemplateResponse","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/cloud/nextcloud/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/cloud/nextcloud/lib/base.php","line":1000,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/cloud/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/cloud/nextcloud/lib/private/Group/Manager.php","Line":333,"CustomMessage":"--"}}
