Fatal error with Woocommerce Subscriptions

Hi, this plugin looks really promising. I was able to go through the configs easily but, when I left the settings page to test it out on my dev site, I got the following error:

Fatal error: Uncaught Error: Call to a member function get_order() on null
in /path/to/wp-content/plugins/woocommerce-subscriptions/vendor/woocommerce/subscriptions-core/wcs-functions.php on line 86

Call stack:

    wcs_get_subscription()
    wp-content/plugins/woocommerce-subscriptions/vendor/woocommerce/subscriptions-core/includes/class-wc-subscriptions-manager.php:906
    WC_Subscriptions_Manager::maybe_cancel_subscription()
    wp-includes/class-wp-hook.php:326
    WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:348
    WP_Hook::do_action()
    wp-includes/plugin.php:517
    do_action()
    wp-includes/post.php:3444
    wp_delete_post()
    wp-content/plugins/yaycurrency/includes/Helpers/Helper.php:221
    Yay_Currency\Helpers\Helper::get_currencies_post_type()
    wp-content/plugins/yaycurrency/includes/Helpers/YayCurrencyHelper.php:118
    Yay_Currency\Helpers\YayCurrencyHelper::converted_currency()
    wp-content/plugins/yaycurrency/includes/Helpers/YayCurrencyHelper.php:265
    Yay_Currency\Helpers\YayCurrencyHelper::detect_current_currency()
    wp-content/plugins/yaycurrency/includes/Engine/Compatibles/WooCommerceNameYourPrice.php:24
    Yay_Currency\E\C\WooCommerceNameYourPrice::__construct()
    wp-content/plugins/yaycurrency/includes/Utils/SingletonTrait.php:12
    Yay_Currency\E\C\WooCommerceNameYourPrice::get_instance()
    wp-content/plugins/yaycurrency/includes/Helpers/Helper.php:36
    Yay_Currency\Helpers\Helper::get_instance_classes()
    wp-content/plugins/yaycurrency/includes/Initialize.php:27
    Yay_Currency\Initialize::__construct()
    wp-content/plugins/yaycurrency/includes/Utils/SingletonTrait.php:12
    Yay_Currency\Initialize::get_instance()
    wp-content/plugins/yaycurrency/yay-currency.php:93
    Yay_Currency\plugin_init()
    wp-includes/class-wp-hook.php:324
    WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:348
    WP_Hook::do_action()
    wp-includes/plugin.php:517
    do_action()
    wp-settings.php:506
    require_once()
    wp-config.php:132
    require_once()
    wp-load.php:50
    require_once()
    wp-blog-header.php:13
    require()
    index.php:17

Please assist.

Cheers,
Vinny