Last update broke my back-end – bad gutenberg integration

Last update broke my backend and I cannot access my backend at all: Looks like the gutenberg integration went bad. Please fix.

Fatal error: Uncaught Error: Call to undefined function register_block_type() in D:\xampp\htdocs\wp-content\plugins\materialis-companion\theme-data\materialis\integrations\gutenberg\integration.php:46 Stack trace: #0 D:\xampp\htdocs\wp-includes\class-wp-hook.php(286): materialis_gutenberg(”) #1 D:\xampp\htdocs\wp-includes\class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #2 D:\xampp\htdocs\wp-includes\plugin.php(453): WP_Hook->do_action(Array) #3 D:\xampp\htdocs\wp-admin\admin.php(156): do_action(‘admin_init’) #4 D:\xampp\htdocs\wp-admin\index.php(10): require_once(‘D:\\xampp\\htdocs…’) #5 {main} thrown in D:\xampp\htdocs\wp-content\plugins\materialis-companion\theme-data\materialis\integrations\gutenberg\integration.php on line 46