Missed management of not existing coupon in YITH POS

It happens when POS plugin create a discount, because it create a coupon on fly and then remove it as soon as the order has been placed.
To fix the issue, developers of Smart Coupons for WooCommerce should add a try/catch block at following path:
public/class-wt-smart-coupon-public.php:361

Wt_Smart_Coupon_Public::get_free_product_for_a_coupon

code solution:

public function get_free_product_for_a_coupon( $coupon_code ) {
    try {
        $coupon        = new WC_Coupon( $coupon_code );
        $coupon_id     = $coupon->get_id();
        $free_products = get_post_meta( $coupon_id, '_wt_free_product_ids', true );

        if ( '' != $free_products && ! is_array( $free_products ) ) {
            $free_products = explode( ',', $free_products );
        } else {
            $free_products = array();
        }
    } catch ( Exception $exception ) {
        $free_products = array();
    }

    return $free_products;
}

Can you integrate the solution suggested above because I can’t apply any discount through POS while this error occured