Erro ao adicionar ao carrinho, produto com variação

Estou com algum problema quando adiciona ao carrinho um produton com variação.

Desativei o plugin e tudo funciona normalmente

Segue erro que aparece no wp-debug

Notice: Trying to get property ‘ID’ of non-object in /home/u532130059/domains/lojasbrasimoveis.com.br/public_html/wp-content/plugins/darven-multiplos-precos-informativos/includes/functions/class-darven-epi-format-final-price.php on line 25

Notice: Trying to get property ‘ID’ of non-object in /home/u532130059/domains/lojasbrasimoveis.com.br/public_html/wp-content/plugins/darven-multiplos-precos-informativos/includes/functions/class-darven-epi-format-final-price.php on line 26

 Fatal error: Uncaught Error: Call to a member function is_type() on null
in /home/u532130059/domains/lojasbrasimoveis.com.br/public_html/wp-content/plugins/darven-multiplos-precos-informativos/includes/functions/class-darven-epi-product-price.php on line 24

Call stack:

1. Darven_Epi_Product_Price::get_active_price()
   wp-content/plugins/darven-multiplos-precos-informativos/includes/functions/class-darven-epi-format-installments-price.php:69
2. Darven_Epi_Format_Installments_Price::get_discount_price()
   wp-content/plugins/darven-multiplos-precos-informativos/includes/functions/class-darven-epi-format-final-price.php:38
3. Darven_Epi_Format_Final_Price::get_discount_price()
   wp-includes/class-wp-hook.php:310
4. WP_Hook::apply_filters()
   wp-includes/plugin.php:205
5. apply_filters()
   wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-product.php:1880
6. WC_Product::get_price_html()
   wp-content/plugins/woocommerce/includes/class-wc-product-variable.php:382
7. WC_Product_Variable::get_available_variation()
   wp-content/plugins/woocommerce/includes/class-wc-product-variable.php:312
8. WC_Product_Variable::get_available_variations()
   wp-content/plugins/shipping-system-live-rates-fulfillment-envia/envia-shipping-module.php:398
9. Envia_Shipping_Module::package_dimensions()
   wp-content/plugins/shipping-system-live-rates-fulfillment-envia/envia-shipping-module.php:337
10. Envia_Shipping_Module::create_format_request()
    wp-content/plugins/shipping-system-live-rates-fulfillment-envia/envia-shipping-module.php:328
11. Envia_Shipping_Module::get_shipping_rates()
    wp-content/plugins/shipping-system-live-rates-fulfillment-envia/envia-shipping-module.php:256
12. Envia_Shipping_Module::calculate_shipping()
    wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-shipping-method.php:233
13. WC_Shipping_Method::get_rates_for_package()
    wp-content/plugins/woocommerce/includes/class-wc-shipping.php:348
14. WC_Shipping::calculate_shipping_for_package()
    wp-content/plugins/woocommerce/includes/class-wc-shipping.php:260
15. WC_Shipping::calculate_shipping()
    wp-content/plugins/woocommerce/includes/class-wc-cart.php:1423
16. WC_Cart::calculate_shipping()
    wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php:339
17. WC_Cart_Totals::get_shipping_from_cart()
    wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php:850
18. WC_Cart_Totals::calculate_shipping_totals()
    wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php:144
19. WC_Cart_Totals::calculate()
    wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php:134
20. WC_Cart_Totals::__construct()
    wp-content/plugins/woocommerce/includes/class-wc-cart.php:1401
21. WC_Cart::calculate_totals()
    wp-includes/class-wp-hook.php:306
22. WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:332
23. WP_Hook::do_action()
    wp-includes/plugin.php:517
24. do_action()
    wp-content/plugins/woocommerce/includes/class-wc-cart.php:1279
25. WC_Cart::add_to_cart()
    wp-content/plugins/woocommerce/includes/class-wc-form-handler.php:918
26. WC_Form_Handler::add_to_cart_handler_variable()
    wp-content/plugins/woocommerce/includes/class-wc-form-handler.php:790
27. WC_Form_Handler::add_to_cart_action()
    wp-includes/class-wp-hook.php:308
28. WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:332
29. WP_Hook::do_action()
    wp-includes/plugin.php:517
30. do_action()
    wp-settings.php:645
31. require_once()
    wp-config.php:107
32. require_once()
    wp-load.php:50
33. require_once()
    wp-blog-header.php:13
34. require()
    index.php:17