Fatal error after woocommerce 2.6.1 Update

When I want to count the products, I get now this message:

Fatal error: Uncaught exception ‘Exception’ with message ‘No parent product set for variation #224’ in …/wp-content/plugins/woocommerce/includes/class-wc-product-variation.php:85 Stack trace: #0 …/wp-content/plugins/woocommerce-order-product-count/WC_Order_Product_Count.php(166): WC_Product_Variation->__construct(224) #1 …./wp-content/plugins/woocommerce-order-product-count/WC_Export_PDF.class.php(95): WC_Export_Orders::get_product_variations(224) #2 [internal function]: WC_Export_PDF::export_PDF(”) #3 …/wp-includes/plugin.php(525): call_user_func_array(Array, Array) #4 …/wp-settings.php(393): do_action(‘init’) #5 …/wp-config.php(90): require_once(‘/www/htdocs/w01…’) #6 …/wp-load.php(37): require_once(‘/www/htdocs/w01…’) #7 …/wp-admin/ in …/wp-content/plugins/woocommerce/includes/class-wc-product-variation.php on line 85

I need your help ??

https://www.ads-software.com/plugins/woocommerce-order-product-count/