The "Strict Standards: Non-static method JLoader::register() should not be called statically" error appears in Joomla sites running on newer PHP versions. This is a PHP compatibility issue with older Joomla code.
Update Joomla or suppress Strict Standards warnings
The proper fix is to update Joomla to the latest version. If you cannot update immediately, suppress Strict Standards in .user.ini:
error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
This error is cosmetic and does not break functionality. Your Joomla site still works, but the warnings clutter your error log and may display on screen if display_errors is enabled.
The same fix applies to similar Strict Standards errors in Joomla, including messages about JParameter, JRegistry, and other J-prefixed classes. These are all caused by deprecated code patterns in older Joomla versions.
For the same error in Tiki Wiki or Moodle, see Tiki Wiki Notice and Moodle Notice.
Need Help Updating Joomla?
Open a Support TicketQuick Recap
- Update Joomla to the latest version for a proper fix
- Suppress Strict Standards in .user.ini as a temporary workaround
- Error is cosmetic - Site still functions
- Affects older Joomla code on modern PHP versions
- Back up before updating
PHP compatibility · Last updated March 2026 · Browse all PHP/MySQL articles
