Please check this error message

Please check this error message I just received:

Fehler-Details

Ein Fehler vom Typ E_ERROR wurde in der Zeile 183 der Datei /www/htdocs/w01cd21a/kagels-trading.de/wp-content/plugins/generateblocks-pro/includes/class-global-styles.php verursacht. Fehlermeldung: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, int given in /www/htdocs/w01cd21a/kagels-trading.de/wp-content/plugins/generateblocks-pro/includes/class-global-styles.php:183
Stack trace:
#0 /www/htdocs/w01cd21a/kagels-trading.de/wp-includes/class-wp-hook.php(309): GenerateBlocks_Pro_Global_Styles->build_css(123030, Object(WP_Post))
#1 /www/htdocs/w01cd21a/kagels-trading.de/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#2 /www/htdocs/w01cd21a/kagels-trading.de/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#3 /www/htdocs/w01cd21a/kagels-trading.de/wp-includes/post.php(4662): do_action(‘save_post_gbloc…’, 123030, Object(WP_Post), true)
#4 /www/htdocs/w01cd21a/kagels-trading.de/wp-includes/post.php(4775): wp_insert_post(Array, false, true)
#5 /www/htdocs/w01cd21a/kagels-trading.de/wp-admin/includes/post.php(426): wp_update_post(Array)
#6 /www/htdocs/w01cd21a/kagels-trading.de/wp-admin/post.php(227): edit_post()
#7 {main}
thrown