error before update

Hi togheter

this morning I made plugin updates. After that I had this error message and could no longer enter into wordpress dashboard = https://dergraph.ch/wordpress/wp-login.php. Wat can I do. Thanks for help and have a good day. Snowbird

Fatal error: Uncaught Error: Attempt to modify property “response” on bool in /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-content/themes/kreo/assets/framework/wp/update-checker/updater/theme-updater-class.php:217 Stack trace: #0 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-includes/class-wp-hook.php(343): ISH_EDD_Theme_Updater->theme_update_transient(false) #1 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-includes/plugin.php(205): WP_Hook->apply_filters(false, Array) #2 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-includes/option.php(2622): apply_filters(‘site_transient_…’, false, ‘update_themes’) #3 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-includes/update.php(956): get_site_transient(‘update_themes’) #4 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-admin/menu.php(38): wp_get_update_data() #5 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-admin/admin.php(163): require(‘/home/httpd/vho…’) #6 /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-admin/index.php(10): require_once(‘/home/httpd/vho…’) #7 {main} thrown in /home/httpd/vhosts/aarton.ch/dergraph.ch/wordpress/wp-content/themes/kreo/assets/framework/wp/update-checker/updater/theme-updater-class.php on line 217