4.0] Joomla 4 Error with Joomla\CMS\Router only for Joomla's registration page · Issue #27356 · joomla/joomla-cms · GitHub
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Joomla! Issue Tracker | Joomla! CMS #15823 - Notice: Undefined index: id in ... /components/com_content/helpers/legacyrouter.php on line 97 since Joomla 3.7
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