[13-Sep-2024 10:23:05 UTC] PHP Fatal error:  Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "kp_get_client_id" not found or invalid function name in /wordpress/core/6.6.2/wp-includes/class-wp-hook.php:324

Stack trace:
#0 /wordpress/core/6.6.2/wp-includes/plugin.php(205): WP_Hook->apply_filters('', Array)
#1 /srv/htdocs/wp-content/plugins/klarna-onsite-messaging-for-woocommerce/klarna-onsite-messaging-for-woocommerce.php(260): apply_filters('kosm_data_clien...', '')
#2 /srv/htdocs/wp-content/plugins/klarna-onsite-messaging-for-woocommerce/klarna-onsite-messaging-for-woocommerce.php(80): Klarna_OnSite_Messaging_For_WooCommerce->set_data_client_id()
#3 /wordpress/core/6.6.2/wp-includes/class-wp-hook.php(324): Klarna_OnSite_Messaging_For_WooCommerce->init('')
#4 /wordpress/core/6.6.2/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#5 /wordpress/core/6.6.2/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#6 /wordpress/core/6.6.2/wp-settings.php(555): do_action('plugins_loaded')
#7 /srv/htdocs/wp-config.php(83): require_once('/wordpress/core...')
#8 /wordpress/core/6.6.2/wp-load.php(55): require_once('/srv/htdocs/wp-...')
#9 /wordpress/core/6.6.2/xmlrpc.php(31): require_once('/wordpress/core...')
#10 {main}
  thrown in /wordpress/core/6.6.2/wp-includes/class-wp-hook.php on line 324