[Structured Data Fix] Uncaught WC_Data_Exception: Invalid product type

This “suddenly” started ~ 2-3 weeks ago, occurring 1-2x per day:

PHP Fatal error:  Uncaught WC_Data_Exception: Invalid product type: passed ID does not correspond to a product variation. in /srv/wp-content/plugins/woocommerce/includes/data-stores/class-wc-product-variation-data-store-cpt.php:58
Stack trace:
#0 /srv/wp-content/plugins/woocommerce/includes/class-wc-data-store.php(159): WC_Product_Variation_Data_Store_CPT->read(Object(WC_Product_Variation))
#1 /srv/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-product.php(138): WC_Data_Store->read(Object(WC_Product_Variation))
#2 /srv/wp-content/plugins/woocommerce/includes/class-wc-product-simple.php(24): WC_Product->__construct(7600)
#3 /srv/wp-content/plugins/woocommerce/includes/class-wc-product-variation.php(54): WC_Product_Simple->__construct(7600)
#4 /srv/wp-content/plugins/woo-product-feed-pro/woocommerce-sea.php(1614): WC_Product_Variation->__construct(7600)
#5 /srv/wp-includes/class-wp-hook.php(307): woosea_product_fix_structured_data(Object(WC_Product_Grouped), Object(WC_Product_Grouped))
#6 /srv/wp-includes/plugin.php(191): WP_Hook->apply_filters(Array, Array)
#7 /srv/wp-content/plugins/woocommerce/includes/class-wc-structured-data.php(328): apply_filters('woocommerce_str...', Array, Object(WC_Product_Grouped))
#8 /srv/wp-includes/class-wp-hook.php(307): WC_Structured_Data->generate_product_data(Object(WC_Product_Grouped))
#9 /srv/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#10 /srv/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#11 /srv/wp-content/plugins/woocommerce/templates/content-single-product.php(60): do_action('woocommerce_sin...')
#12 /srv/wp-includes/template.php(772): require('/srv/wp-content...')
#13 /srv/wp-content/plugins/woocommerce/includes/wc-core-functions.php(284): load_template('/srv/wp-content...', false)
#14 /srv/wp-content/plugins/woocommerce/templates/single-product.php(37): wc_get_template_part('content', 'single-product')
#15 /srv/wp-includes/template-loader.php(106): include('/srv/wp-content...')
#16 /srv/wp-blog-header.php(19): require_once('/srv/wp-content...')
#17 /srv/index.php(17): require('/srv/wp-content...')
#18 {main}
  thrown in /srv/wp-content/plugins/woocommerce/includes/data-stores/class-wc-product-variation-data-store-cpt.php on line 58

The product IDs so far have always been some variable product’s base ID.

Unfortunately I don’t know which update triggered nor how to manually reproduce it, but fortunately I haven’t seen issues with the fixed structured data (well, not *more* issues, that is: every now & then Google Merchant reports mismatches that turn out to be phantoms when I check).

Looking at the code, the line reported is:

$product_variations = new WC_Product_Variation( $child_val );

With $child_val being derived from:

$children_ids = $product->get_children();

Maybe there should be a check added, similar to this one?:

if ($product->is_type('variable')) {
    foreach ($product->get_children() as $variation_product_id) {
        $products[] = wc_get_product($variation_product_id);
    }
} else {
    $products[] = $product;
}