If you find a white screen or error 500 that usually means something has triggered a PHP error, but errors are hidden on your server. To find out the cause of the error you have two choices:

  • Look at your server error logs and find the latest fatal error
  • Enable WP_DEBUG mode and view the page again

Enabling WP_DEBUG involves editing your wp-config.php file and changing, or adding if its not there:

define( 'WP_DEBUG', true );

When this is done, a more useful error message should be shown. Most of the time this contains the name of the plugin and the line number causing the issue allowing you to act.