Fatal error: Uncaught TypeError: RWMB_Helpers_Field::get_class(): Argument #1 ($field) must be of type array, null given, called in /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/field.php on line 531 and defined in /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/helpers/field.php:22
Stack trace:
#0 /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/field.php(531): RWMB_Helpers_Field::get_class(NULL)
#1 /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/meta-box.php(299): RWMB_Field::call('normalize', NULL)
#2 /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/meta-box.php(51): RW_Meta_Box::normalize_fields(Array, Object(RWMB_Post_Storage))
#3 /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/meta-box-registry.php(19): RW_Meta_Box->__construct(Array)
#4 /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/core.php(29): RWMB_Meta_Box_Registry->make(Array)
#5 /customers/4/2/f/katus.se/httpd.www/wp-includes/class-wp-hook.php(308): RWMB_Core->register_meta_boxes('')
#6 /customers/4/2/f/katus.se/httpd.www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)
#7 /customers/4/2/f/katus.se/httpd.www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#8 /customers/4/2/f/katus.se/httpd.www/wp-settings.php(617): do_action('init')
#9 /customers/4/2/f/katus.se/httpd.www/wp-config.php(120): require_once('/customers/4/2/...')
#10 /customers/4/2/f/katus.se/httpd.www/wp-load.php(50): require_once('/customers/4/2/...')
#11 /customers/4/2/f/katus.se/httpd.www/wp-blog-header.php(13): require_once('/customers/4/2/...')
#12 /customers/4/2/f/katus.se/httpd.www/index.php(17): require('/customers/4/2/...')
#13 {main}
  thrown in /customers/4/2/f/katus.se/httpd.www/wp-content/plugins/meta-box/inc/helpers/field.php on line 22