I have the same problem, but also found a temporary workaround. I commented out lines 141-144 in bambora-online-checkout.php which seemed to active the problem code. It can be changed in the plugin file editor at your own risk. It did solve my problem and I couldn’t see any immediate bad effects of this. Here is the change I did (adding /** and */):
140? ? ? ? ? ? ? ? ? ? ? ??if?(?is_admin()?)?{
141? ?/**? ? ? ? ? ? ? ? ? ? ? ? ??add_action(?‘add_meta_boxes’,?array(
142? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??$this,
143? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??‘bambora_online_checkout_meta_boxes’
144? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??)?); */
145? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??add_action(?‘woocommerce_update_options_payment_gateways_’?.?$this->id,?array(
146? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??$this,
147? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??‘process_admin_options’
148? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??)?);
Here is the stack trace I received:
Uncaught Exception: Invalid order. in /home/silverfishno/silverfish.no/public/wp-content/plugins/woocommerce/includes/data-stores/abstract-wc-order-data-store-cpt.php:120
Stack trace:
#0 /home/silverfishno/silverfish.no/public/wp-content/plugins/woocommerce/includes/class-wc-data-store.php(159): Abstract_WC_Order_Data_Store_CPT->read()
#1 /home/silverfishno/silverfish.no/public/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-order.php(128): WC_Data_Store->read()
#2 /home/silverfishno/silverfish.no/public/wp-content/plugins/bambora-online-checkout/bambora-online-checkout.php(1403): WC_Abstract_Order->__construct()
#3 /home/silverfishno/silverfish.no/public/wp-includes/class-wp-hook.php(310): Bambora_Online_Checkout->bambora_online_checkout_meta_boxes()
#4 /home/silverfishno/silverfish.no/public/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#5 /home/silverfishno/silverfish.no/public/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /home/silverfishno/silverfish.no/public/wp-admin
