Fatal Error When Viewing Cart Using WooCommerce Product Add-On

Hey guys.
I tried this product addon: https://wordpress.org/plugins/woocommerce-product-addon/

Which produced the below error. I have the latest version of WooCommerce. Are your templates up-to-date with it? Just trying to figure out what produced this. Thanks…

Fatal error: Uncaught Exception: Invalid product. in /home/justins6/public_html/wp-content/plugins/woocommerce/includes/data-stores/class-wc-product-data-store-cpt.php:152 Stack trace: #0 /home/justins6/public_html/wp-content/plugins/woocommerce/includes/class-wc-data-store.php(159): WC_Product_Data_Store_CPT->read(Object(WC_Product)) #1 /home/justins6/public_html/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-product.php(134): WC_Data_Store->read(Object(WC_Product)) #2 /home/justins6/public_html/wp-content/plugins/woocommerce-product-addon/inc/functions.php(408): WC_Product->__construct(11127) #3 /home/justins6/public_html/wp-content/plugins/woocommerce-product-addon/inc/woocommerce.php(538): ppom_make_meta_data(Array) #4 /home/justins6/public_html/wp-includes/class-wp-hook.php(286): ppom_woocommerce_add_item_meta(Array, Array) #5 /home/justins6/public_html/wp-includes/plugin.php(208): WP_Hook->apply_filters(Array, Array) #6 /home/justins6/public_html/wp-content/plugins/woocommerce/includes/wc-template-fun in /home/justins6/public_html/wp-content/plugins/woocommerce/includes/data-stores/class-wc-product-data-store-cpt.php on line 152