WordPress Admin Not Working – Error 500
If you find after updating a WordPress version the website functions but you can no longer login to the admin area there is more than likely an issue with a plugin or the theme.
The quickest solution is edit the database options table.
- Locate table wp_options
- Find the active_plugins row
- Change the option_value field to: a:0:{}
This will disable all plugins, now try and login to WordPress.