Getting Lots of fatal error on latest version (1.9.55)

Masum

I am getting lots of call to undefined method error after updating the free plugin.

PHP Fatal error: Uncaught Error: Call to undefined method WC_Product_Simple::get_stock_on_hold() in atum-stock-manager-for-woocommerce/classes/Inc/Helpers.php:2030

Like above.

Salva

Hi Masum

We have seen this happening to some sites using object caching (mainly WP Engine-hosted sites).
If this is your case, go to ATUM Settings >> Advanced and turn on the "Disable ATUM orders' object caching" option and save.
And let me know if this fixes your issue.

Best Regards,
Salva.