InvalidArgumentException: Invalid weight unit "" provided. in Drupal\physical\WeightUnit::assertExists()

Problem/Motivation

We ship products world wide and have issues with address/weight validation.

Add item to cart and complete address information.
Upon completion following error shows on top:
"Oops, something went wrong. Check your browser's developer console for more details."

Checked developer console and following error are shown:

Failed to load resource: the server responded with a status of 500 ()

Drupal.AjaxError
message
:
"\nAn AJAX HTTP error occurred.\nHTTP Result Code: 500\nDebugging information follows.\nPath: /checkout/5232/order_information?ajax_form=1\nStatusText: error\nResponseText: The website encountered an unexpected error. Try again later."
name
:
"AjaxError"

Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.

Verified the weight unit in shipping method and appears to be correct.
Verified the product weight in product variation and there are no issues.
Verified the countries are indeed set in shipping method.
Tested same product using different addresses:
Addresses that are known to be working, (e.g. US/UK/Australia/Canada) the error goes away.
Addresses that are tested to have issues (Japan, Brunei) the errors will appear.

In DB log the following errors are showing.

InvalidArgumentException: Invalid weight unit "" provided. in Drupal\physical\WeightUnit::assertExists() (line 68 of /public_html/modules/contrib/physical/src/WeightUnit.php).

#0 /public_html/modules/contrib/physical/src/WeightUnit.php(42): Drupal\physical\WeightUnit::assertExists()
#1 /public_html/modules/contrib/physical/src/Measurement.php(105): Drupal\physical\WeightUnit::getBaseFactor()
#2 /public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/Condition/ShipmentWeight.php(140): Drupal\physical\Measurement->convert()
#3 /public_html/modules/contrib/commerce/src/ConditionGroup.php(86): Drupal\commerce_shipping\Plugin\Commerce\Condition\ShipmentWeight->evaluate()
#4 /public_html/modules/contrib/commerce_shipping/src/Entity/ShippingMethod.php(252): Drupal\commerce\ConditionGroup->evaluate()
#5 /public_html/modules/contrib/commerce_shipping/src/ShippingMethodStorage.php(39): Drupal\commerce_shipping\Entity\ShippingMethod->applies()
#6 /public_html/modules/contrib/commerce_shipping/src/ShipmentManager.php(83): Drupal\commerce_shipping\ShippingMethodStorage->loadMultipleForShipment()
#7 /public_html/modules/contrib/commerce_shipping/src/Plugin/Field/FieldWidget/ShippingRateWidget.php(101): Drupal\commerce_shipping\ShipmentManager->calculateRates()
#8 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(459): Drupal\commerce_shipping\Plugin\Field\FieldWidget\ShippingRateWidget->formElement()
#9 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(219): Drupal\Core\Field\WidgetBase->formSingleElement()
#10 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(120): Drupal\Core\Field\WidgetBase->formMultipleElements()
#11 /public_html/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php(190): Drupal\Core\Field\WidgetBase->form()
#12 /public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/CheckoutPane/ShippingInformation.php(296): Drupal\Core\Entity\Entity\EntityFormDisplay->buildForm()
#13 /public_html/modules/contrib/commerce/modules/checkout/src/Plugin/Commerce/CheckoutFlow/CheckoutFlowWithPanesBase.php(546): Drupal\commerce_shipping\Plugin\Commerce\CheckoutPane\ShippingInformation->buildPaneForm()
#14 [internal function]: Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowWithPanesBase->buildForm()
#15 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(536): call_user_func_array()
#16 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(375): Drupal\Core\Form\FormBuilder->retrieveForm()
#17 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(633): Drupal\Core\Form\FormBuilder->rebuildForm()
#18 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(326): Drupal\Core\Form\FormBuilder->processForm()
#19 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(224): Drupal\Core\Form\FormBuilder->buildForm()
#20 /public_html/modules/contrib/commerce/modules/checkout/src/Controller/CheckoutController.php(143): Drupal\Core\Form\FormBuilder->getForm()
#21 [internal function]: Drupal\commerce_checkout\Controller\CheckoutController->formPage()
#22 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#23 /public_html/core/lib/Drupal/Core/Render/Renderer.php(638): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#24 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(121): Drupal\Core\Render\Renderer->executeInRenderContext()
#25 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#26 /public_html/vendor/symfony/http-kernel/HttpKernel.php(181): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#27 /public_html/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#28 /public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle()
#29 /public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#30 /public_html/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#31 /public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(116): Drupal\Core\StackMiddleware\ContentLength->handle()
#32 /public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(90): Drupal\page_cache\StackMiddleware\PageCache->pass()
#33 /public_html/modules/contrib/advban/src/AdvbanMiddleware.php(57): Drupal\page_cache\StackMiddleware\PageCache->handle()
#34 /public_html/core/modules/ban/src/BanMiddleware.php(50): Drupal\advban\AdvbanMiddleware->handle()
#35 /public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle()
#36 /public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#37 /public_html/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#38 /public_html/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\AjaxPageState->handle()
#39 /public_html/core/lib/Drupal/Core/DrupalKernel.php(741): Drupal\Core\StackMiddleware\StackedHttpKernel->handle()
#40 /public_html/index.php(19): Drupal\Core\DrupalKernel->handle()
#41 {main}

Warning: Trying to access array offset on null in Drupal\commerce_shipping\Plugin\Commerce\Condition\ShipmentWeight->evaluate() (line 138 of /public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/Condition/ShipmentWeight.php)
#0 /public_html/core/includes/bootstrap.inc(166): _drupal_error_handler_real()
#1 /public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/Condition/ShipmentWeight.php(138): _drupal_error_handler()
#2 /public_html/modules/contrib/commerce/src/ConditionGroup.php(86): Drupal\commerce_shipping\Plugin\Commerce\Condition\ShipmentWeight->evaluate()
#3 /public_html/modules/contrib/commerce_shipping/src/Entity/ShippingMethod.php(252): Drupal\commerce\ConditionGroup->evaluate()
#4 /public_html/modules/contrib/commerce_shipping/src/ShippingMethodStorage.php(39): Drupal\commerce_shipping\Entity\ShippingMethod->applies()
#5 /public_html/modules/contrib/commerce_shipping/src/ShipmentManager.php(83): Drupal\commerce_shipping\ShippingMethodStorage->loadMultipleForShipment()
#6 /public_html/modules/contrib/commerce_shipping/src/Plugin/Field/FieldWidget/ShippingRateWidget.php(101): Drupal\commerce_shipping\ShipmentManager->calculateRates()
#7 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(459): Drupal\commerce_shipping\Plugin\Field\FieldWidget\ShippingRateWidget->formElement()
#8 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(219): Drupal\Core\Field\WidgetBase->formSingleElement()
#9 /public_html/core/lib/Drupal/Core/Field/WidgetBase.php(120): Drupal\Core\Field\WidgetBase->formMultipleElements()
#10 /public_html/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php(190): Drupal\Core\Field\WidgetBase->form()
#11 /public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/CheckoutPane/ShippingInformation.php(296): Drupal\Core\Entity\Entity\EntityFormDisplay->buildForm()
#12 /public_html/modules/contrib/commerce/modules/checkout/src/Plugin/Commerce/CheckoutFlow/CheckoutFlowWithPanesBase.php(546): Drupal\commerce_shipping\Plugin\Commerce\CheckoutPane\ShippingInformation->buildPaneForm()
#13 [internal function]: Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowWithPanesBase->buildForm()
#14 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(536): call_user_func_array()
#15 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(375): Drupal\Core\Form\FormBuilder->retrieveForm()
#16 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(633): Drupal\Core\Form\FormBuilder->rebuildForm()
#17 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(326): Drupal\Core\Form\FormBuilder->processForm()
#18 /public_html/core/lib/Drupal/Core/Form/FormBuilder.php(224): Drupal\Core\Form\FormBuilder->buildForm()
#19 /public_html/modules/contrib/commerce/modules/checkout/src/Controller/CheckoutController.php(143): Drupal\Core\Form\FormBuilder->getForm()
#20 [internal function]: Drupal\commerce_checkout\Controller\CheckoutController->formPage()
#21 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#22 /public_html/core/lib/Drupal/Core/Render/Renderer.php(638): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#23 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(121): Drupal\Core\Render\Renderer->executeInRenderContext()
#24 /public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#25 /public_html/vendor/symfony/http-kernel/HttpKernel.php(181): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#26 /public_html/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#27 /public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle()
#28 /public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#29 /public_html/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#30 /public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(116): Drupal\Core\StackMiddleware\ContentLength->handle()
#31 /public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(90): Drupal\page_cache\StackMiddleware\PageCache->pass()
#32 /public_html/modules/contrib/advban/src/AdvbanMiddleware.php(57): Drupal\page_cache\StackMiddleware\PageCache->handle()
#33 /public_html/core/modules/ban/src/BanMiddleware.php(50): Drupal\advban\AdvbanMiddleware->handle()
#34 /public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle()
#35 /public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#36 /public_html/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#37 /public_html/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\AjaxPageState->handle()
#38 /public_html/core/lib/Drupal/Core/DrupalKernel.php(741): Drupal\Core\StackMiddleware\StackedHttpKernel->handle()
#39 /public_html/index.php(19): Drupal\Core\DrupalKernel->handle()
#40 {main}