Bug SimpleProduct WP Subscription Pro

Hi

I got the following error while updating from 1.13.0 to 1.14.1 plugin Subscription Pro ( not the free version)

E_COMPILE_ERROR en la línea 13 del archivo /home/customer/www/domain/public_html/wp-content/plugins/subscription-pro/includes/Utils/SimpleProduct.php. Mensaje de error: Declaration of SpringDevs\SubscriptionPro\Utils\SimpleProduct::get_signup_fee(): int must be compatible with SpringDevs\Subscription\Utils\Product::get_signup_fee(): float

Site crash; deactivating plugin and website goes again (but no subscriptions)