Unable to save customers with certain TJ fields null

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Prerequisites

• Are you running the latest version of our extension?
• Have you reviewed our integration guide?
• Did you search through existing issues?

Description

When saving customers if the tj_exemption_regions or tj_last_sync are null, we get the following PHP errors. This occcurs on Magento 2.4.6-P5 and PHP 8.2. This did not occur on PHP7.4 for us.

Call to a member function getValue() on null at vendor/taxjar/module-taxjar/Observer/Customer/Save.php:57

Call to a member function getValue() on null in vendor/taxjar/module-taxjar/Observer/Customer/Save.php:80

Steps to Reproduce

1. Go edit a customer
2. Make sure the last sync date and exempt regions are null.
3. Save the customer

Expected Result

Editing the customer should be successful

Actual Result

PHP error - customer does not save.

Versions

Magento 2.4.6-p5

• Magento 2.4

• Magento 2.3

• Magento Open Source (fka Magento 2 Community Edition)

• Adobe Commerce (fka Magento 2 Enterprise Edition)

• PHP 8.2

• PHP 8.1

• PHP 7.4

• PHP 7.3