Hi,
I’m having a critical issue with WooCommerce order emails not sending to customers, and it appears to be directly caused by the EventON Tickets plugin.

Here are the details:

When WooCommerce tries to send an order email (both “Processing Order” and “Completed Order”), the email fails silently and nothing is delivered to the customer.

The error logs show repeated fatal errors coming from EventON Tickets when emails are triggered.

Error message from WooCommerce fatal logs:
Critical Uncaught Error: Call to a member function get_meta() on bool
in /wp-content/plugins/eventon-tickets/includes/class-functions.php:55

additionnal context:
Additional context
{
"error": {
"type": 1,
"file": "/home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/eventon-tickets/includes/class-functions.php",
"line": 55
},
"remote-logging": true,
"backtrace": [
"",
"#0 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/eventon-tickets/includes/class-integration-woocommerce.php(1052): evotx_functions->does_order_have_tickets(false)",
"#1 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/class-wp-hook.php(326): EVOTX_WC->autocomplete_orders('completed', 12345)",
"#2 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('completed', Array)",
"#3 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-order.php(352): apply_filters('woocommerce_pay...', 'completed', 12345, Object(WC_Order))",
"#4 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-order.php(321): WC_Order->maybe_set_date_paid()",
"#5 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreview.php(442): WC_Order->set_status('processing')",
"#6 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreview.php(394): AutomatticWooCommerceInternalAdminEmailPreviewEmailPreview->apply_dummy_order_status(Object(WC_Order))",
"#7 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreview.php(216): AutomatticWooCommerceInternalAdminEmailPreviewEmailPreview->get_dummy_order()",
"#8 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreviewRestController.php(242): AutomatticWooCommerceInternalAdminEmailPreviewEmailPreview->set_email_type('WC_Email_Custom...')",
"#9 /home/customer/www/rachelb155.sg-host.com/public_html/wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreviewRestController.php(144): AutomatticWooCommerceInternalAdminEmailPreviewEmailPreviewRestController->validate_email_type('WC_Email_Custom...')",
"#10 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/rest-api/class-wp-rest-request.php(930): AutomatticWooCommerceInternalAdminEmailPreviewEmailPreviewRestController->AutomatticWooCommerceInternalAdminEmailPreview{closure}('WC_Email_Custom...', Object(WP_REST_Request), 'type')",
"#11 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/rest-api/class-wp-rest-server.php(1114): WP_REST_Request->has_valid_params()",
"#12 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/rest-api/class-wp-rest-server.php(439): WP_REST_Server->dispatch(Object(WP_REST_Request))",
"#13 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/rest-api.php(459): WP_REST_Server->serve_request('/wc-admin-email...')",
"#14 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/class-wp-hook.php(324): rest_api_loaded(Object(WP))",
"#15 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)",
"#16 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/plugin.php(565): WP_Hook->do_action(Array)",
"#17 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/class-wp.php(418): do_action_ref_array('parse_request', Array)",
"#18 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/class-wp.php(818): WP->parse_request('')",
"#19 /home/customer/www/rachelb155.sg-host.com/public_html/wp-includes/functions.php(1342): WP->main('')",
"#20 /home/customer/www/rachelb155.sg-host.com/public_html/wp-blog-header.php(16): wp()",
"#21 /home/customer/www/rachelb155.sg-host.com/public_html/index.php(17): require('/home/customer/...')",
"#22 {main}",
"thrown"
]
}

This happens even with a real WooCommerce order (not only with the “Send a test email” button).
Because of this fatal error, the WooCommerce order email never gets sent.

What I have already confirmed:

- Email delivery works fine on my site (I receive other WordPress emails).
- WooCommerce transactional emails are enabled.
-The issue only happens when EventON Tickets is active.
- Disabling the EventON Tickets plugin allows WooCommerce to send order emails normally.

This indicates that EventON Tickets is hooking into WooCommerce emails and calling $order->get_meta() even when $order is not a valid WC_Order object.

Environment:

WordPress (latest)
WooCommerce (HPOS enabled)
EventON (latest)
EventON Tickets (latest)

Please advise on how to fix this, or provide a patched file,
Thank you.