class-wp-hook.php on line 288
Reinstalling core should fix this issue. This is more than likely related to a botched update from 5.3 to 5.3.1. Edit: To clarify, 5.3.1 included some hardening with relation to kses (specifically wp_kses_bad_protocol()) as noted in the release post. In the error output above, a core file was referencing a core function that didn’t exist, … Read more