Fatal error when adding order as admin

Hi. I tried to create an order for a client as admin using woocommerce and wp crowdfunding plugins, but on products section on creating a new order, there is an error that prevents me from adding any products to order. The error stands as follows:
Fatal error: Uncaught Error: Call to a member function get_cart() on null in /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-content/plugins/wp-crowdfunding/includes/woocommerce/class-wpneo-crowdfunding.php:683 Stack trace: #0 /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-includes/class-wp-hook.php(286): Wpneo_Crowdfunding->wpneo_wc_coupon_disable(true) #1 /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-includes/plugin.php(208): WP_Hook->apply_filters(true, Array) #2 /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-content/plugins/woocommerce/includes/wc-coupon-functions.php(69): apply_filters('woocommerce_cou...', true) #3 /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-content/plugins/woocommerce/includes/admin/meta-boxes/views/html-order-items.php(223): wc_coupons_enabled() #4 /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-items.php(41): include('/home/klient.dh...') #5 /home/klient.dhosting.p in /home/klient.dhosting.pl/aido/kizango.pl/public_html/wp-content/plugins/wp-crowdfunding/includes/woocommerce/class-wpneo-crowdfunding.php on line 683