Can't sent out shipment email - Call to a member function getUrl() on null

[loppp]

Have been getting the

Call to a member function getUrl() on null

error.

In cron.log

[2020-03-31 09:39:09] main.INFO: Cron Job sales_send_order_shipment_emails is run [] []
[2020-03-31 09:39:09] main.ERROR: Cron Job sales_send_order_shipment_emails has an error: Call to a member function getUrl() on null. Statistics: {"sum":0,"count":1,"realmem":0,"emalloc":0,"realmem_start":88080384,"emalloc_start":58127880} [] []
[2020-03-31 09:39:09] main.CRITICAL: Error when running a cron job {"exception":"[object] (RuntimeException(code: 0): Error when running a cron job at /home/wwwroot/vendor/magento/module-cron/Observer/ProcessCronQueueObserver.php:330, Error(code: 0): Call to a member function getUrl() on null at /home/wwwroot/vendor/magento/module-sales/view/frontend/templates/email/shipment/track.phtml:28)"} []

Thought was the problem that left the Tracking URL field in blank in configuration, but the problem still exists after I fill in the Tracking URL field.

[owebia]

Hi,

It seems to be a bug on Magento 2.3.3: magento/magento2#25221 (comment)

Best Regards,
A.L.