PHP Warning: Undefined array key “prefixes”

For the last month or so I’ve been seeing the following messages in the PHP error logs:

[2026-04-15 13:19:32] Undefined array key “prefixes”
E_WARNING at /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-utility.php(1301):
0 /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-utility.php(1301): {closure}()
1 /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-cronjob-handler.php(148): AIOWPSecurity_Utility::get_googlebot_ip_ranges()
2 /wp-includes/class-wp-hook.php(341): AIOWPSecurity_Cronjob_Handler->aios_update_googlebot_ip_ranges()
3 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
4 /wp-includes/plugin.php(522): WP_Hook->do_action()
5 /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-cronjob-handler.php(89): do_action()
6 /wp-includes/class-wp-hook.php(341): AIOWPSecurity_Cronjob_Handler->aiowps_daily_cron_event_handler()
7 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
8 /wp-includes/plugin.php(570): WP_Hook->do_action()
9 /wp-cron.php(191): do_action_ref_array()
10 {main}