Warning: Trying to access array offset (when PHP is updated at webhost)

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Hello, I updated my PHP settings at webhost (siteground) and see the following error in PHP 8.3.1
this warning displays:
Warning: Trying to access array offset on value of type null in /home/customer/www/REMOVED-for-SECURITY/public_html/wp-content/plugins/gravityformschainedselects/includes/class-gf-field-chainedselect.php on line 526

in PHP 8.0.30
same warning displays:
Warning: Trying to access array offset on value of type null in /home/customer/www/REMOVED-for-SECURITY/public_html/wp-content/plugins/gravityformschainedselects/includes/class-gf-field-chainedselect.php on line 526

in PHP 7.4.33
NO WARNING (YAY)
Error disappears.

SO, how do we fix this so that I can update PHP and not have this error display?

Thanks in advance.

2

This has also been submitted to the GF support team; will update or delete this thread based on response.

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