Thank you so much!
I changed REST API setting of Hardening!
Hi, my server using PHP7.2, but still white out!
So I came here and changed common.php
====
Edit line 1970 of wp-content/plugins/wp-cerber/common.php and replace
$headers = [];
with
$headers = array();
====
Then, it worked! So this is not because of latest PHP version?
