Default UPS extension crashes checkout a step 2

[timlight10]

Hi there,
Users are reporting that when they get to checkout step 2, they get back a blank page.
In my error log I see this:

Code Select Expand

2025-10-05 8:51:16 - Unknown Error: AbanteCart core v.1.3.4 Call to a member function getElementsByTagName() on null in <b>/public_html/dps/extensions/default_ups/storefront/model/extension/default_ups.php</b> on line <b>462</b>Disabling the default UPS module allows checkouts to continue.
Any advice?