Error on checkout/payment pages

recently every payment attempt failed. we see this error in the log files:

[php:error] PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Ni_Payment_Gateway_Charge does not have a method "save_payment_gateway_charge_from_checkout" in /var/www/XXX/wp-includes/class-wp-hook.php:341\nStack trace:\n#0 /var/www/XXX/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()\n#1 /var/www/XXX/wp-includes/plugin.php(522): WP_Hook->do_action()\n#2 /var/www/XXX/wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1352): do_action()\n#3 /var/www/XXX/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(596): WC_Checkout->process_checkout()\n#4 /var/www/XXX/wp-includes/class-wp-hook.php(341): WC_AJAX::checkout()\n#5 /var/www/XXX/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()\n#6 /var/www/XXX/wp-includes/plugin.php(522): WP_Hook->do_action()\n#7 /var/www/XXX/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(127): do_action()\n#8 /var/www/XXX/wp-includes/class-wp-hook.php(341): WC_AJAX::do_wc_ajax()\n#9 /var/www/XXX/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()\n#10 /var/www/XXX/wp-includes/plugin.php(522): WP_Hook->do_action()\n#11 /var/www/XXX/wp-includes/template-loader.php(23): do_action()\n#12 /var/www/XXX/wp-blog-header.php(19): require_once('…')\n#13 /var/www/XXX/index.php(17): require('…')\n#14 {main}\n thrown in /var/www/XXX/wp-includes/class-wp-hook.php on line 341, referer: https://XXX/kasse/

We run your plugins:
Ni Cost of Goods for WooCommerce
Ni WooCommerce Cost Of Goods Pro

After disabling them, the checkout worked again. Can you please tell me how to fix this issue?