Error in version 3.0

When an editor tries to edit a page in the WordPress admin area, the screen becomes completely white.

In the PHP error log, the following warnings are generated:

[30-Jan-2026 10:09:35 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/fcitestadm1n/public_html/wp-admin/includes/template.php:2663) in /home/fcitestadm1n/public_html/wp-includes/pluggable.php on line 1531 [30-Jan-2026 10:09:35 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/fcitestadm1n/public_html/wp-admin/includes/template.php:2663) in /home/fcitestadm1n/public_html/wp-includes/pluggable.php on line 1534

If the plugin is disabled, the issue disappears and the editor can modify pages normally.