Strict Standards: Non-static method JLoader::register() should

Knowledgebase

PHP/MySQL | Updated 2026

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.

Fix

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.