How To Fix Fatal Error wp_print_font_faces Not Found

Ever went pulling your hair because of this error? And no matter what you activate, deactivate, nothing would help?

[24-Mar-2024 04:34:18 UTC] PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "wp_print_font_faces" not found or invalid function name in wp-includes/class-wp-hook.php:324
Stack trace:
#0 wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#1 wp-includes/plugin.php(517): WP_Hook->do_action()
#2 wp-admin/admin-header.php(132): do_action()
#3 wp-admin/index.php(137): require_once('...')
#4 {main}
thrown in wp-includes/class-wp-hook.php on line 324

This error is caused by this file: wp-admin/includes/admin-filters.php And this happens when a WordPress update fails to delete this file.

How to Fix Fatal error: Uncaught TypeError: call_user_func_array… wp_print_font_faces

The ideal way to update WordPress is through the dashboard. But just in case you felt a little geeky-nerdy and simply overwrote the wp-admin and wp-includes folders, this method would overwrite the files and skip deleting the old, redundant files. All you have to do is to delete the file wp-admin/includes/admin-filters.php. The right way though is to delete wp-admin and wp-includes folders and then upload them afresh.

This article is written by Evelyn Allison. Evelyn has over two decades of experience with the big-tech corporate giants. Starting in 2002 with consumer IT remote support, he transitioned into IT enterprise support and systems provisioning for Windows and Linux servers. Her prowess spans her expertise in network security, security audit and scripting-based-automation. Actively involved in web security since 2017, Evelyn has worked with various technologies to secure the web, leveraging tech like Nginx, modsecurity, reverse-proxies, developing web-application-firewalls, on-the-fly asset optimization using Google’s PageSpeed Module and more. Her expertise is reflected in the top-tier plugins and comprehensive consulting-services she offers in the domain of web-security.