What happened?

Steps that created the issue :

• Backoffice > Joomla Update
• Update Joomla from distant repository (also tried with "Upload and update"
• crashes immediately

Version

6.0

Expected result

Update to Joomla 6.1.1 should operate normally

Actual result

Log Entry in /administrator/log/everything.php:
2026-06-18T06:34:20+00:00 CRITICAL error Uncaught Throwable of type Joomla\CMS\Router\Exception\RouteNotFoundException thrown with message "Page introuvable". Stack trace: #0 [ROOT]/libraries/src/Application/SiteApplication.php(761): Joomla\CMS\Router\Router->parse() #1 [ROOT]/libraries/src/Application/SiteApplication.php(243): Joomla\CMS\Application\SiteApplication->route() #2 [ROOT]/libraries/src/Application/CMSApplication.php(320): Joomla\CMS\Application\SiteApplication->doExecute() #3 [ROOT]/includes/app.php(58): Joomla\CMS\Application\CMSApplication->execute() #4 [ROOT]/index.php(51): require_once('/home/...') #5 {main}

See the crash here : https://prnt.sc/SjHXgm-vsWuT

System Information

Joomla! Version: 6.0.0
PHP Version: 8.3
Web Server: Apache,
Database: 11.4.12-MariaDB 
Template: Helix Ulitmate 2.2.6

Additional Comments

Codebase:
[SiteApplication.php]
[RouteNotFoundException.php]
[CMSApplication.php]
[ExceptionHandler.php]

already tried to modify every hosting variables :

• php_max_file_size, php_memory_limit
• tmp directory IS writable

Any relation with issue 45781 ? : #45781
Thank you all

Phil