Critical error on latest version

I’m getting a critical error in the backend even after updating to version 5.6.11 on WordPress version 6.1.1

I also have meta-box-conditional-logic, meta-box-group, meta-box-include-exclude and meta-box-tabs installed all of which are on the latest versions

Fatal error: Uncaught TypeError: Return value of RWMB_Update_Option::get_api_key() must be of the type string, null returned in /web/app/plugins/meta-box/inc/update/option.php:28
Stack trace:
#0 /web/app/plugins/meta-box/inc/update/checker.php(135): RWMB_Update_Option->get_api_key()
#1 /web/app/plugins/meta-box/inc/update/checker.php(83): RWMB_Update_Checker->request('plugins')
#2 /web/wp/wp-includes/class-wp-hook.php(310): RWMB_Update_Checker->check_updates(Object(stdClass))
#3 /web/wp/wp-includes/plugin.php(205): WP_Hook->apply_filters(Object(stdClass), Array)
#4 /web/wp/wp-includes/option.php(2018): apply_filters('pre_set_site_tr...', Object(stdClass), 'update_plugins')
#5 /web/wp/wp-includes/update.php(391): set_site_transient('update_plugins', Object(stdClass))
#6 [internal function]: wp_update_plugins()
#7 phar:///us in /web/app/plugins/meta-box/inc/update/option.php on line 28
Error: There has been a critical error on this website.Learn more about troubleshooting WordPress. There has been a critical error on this website.