Fatal error during wp-ajax

I’m seeing 500 errors in the logs during some calls to wp-admin/admin-ajax.php:

[28-Jan-2024 01:37:10 UTC] PHP Warning: Undefined array key "gpfwproductID" in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 9

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: stripslashes(): Passing null to parameter #1 ($string) of type string is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 9

[28-Jan-2024 01:37:10 UTC] PHP Warning: Undefined array key "var_pro_ID" in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 10

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: stripslashes(): Passing null to parameter #1 ($string) of type string is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 10

[28-Jan-2024 01:37:10 UTC] PHP Fatal error: Uncaught Error: Call to a member function get_price() on bool in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php:17

Stack trace:

#0 /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/class-gift-pack-for-woocommerce-public.php(223): include()

#1 /nas/content/live/wpsite/wp-includes/class-wp-hook.php(324): Gift_Pack_For_Woocommerce_Public->gpfw_check_gift_wrap_function('')

#2 /nas/content/live/wpsite/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)

#3 /nas/content/live/wpsite/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#4 /nas/content/live/wpsite/wp-admin/admin-ajax.php(203): do_action('wp_ajax_nopriv_...')

#5 {main}

thrown in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 17

[28-Jan-2024 01:37:10 UTC] PHP Warning: Undefined array key "gpfwproductID" in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 9

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: stripslashes(): Passing null to parameter #1 ($string) of type string is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 9

[28-Jan-2024 01:37:10 UTC] PHP Warning: Undefined array key "var_pro_ID" in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 10

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: stripslashes(): Passing null to parameter #1 ($string) of type string is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 10

[28-Jan-2024 01:37:10 UTC] PHP Fatal error: Uncaught Error: Call to a member function get_price() on bool in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php:17

Stack trace:

#0 /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/class-gift-pack-for-woocommerce-public.php(223): include()

#1 /nas/content/live/wpsite/wp-includes/class-wp-hook.php(324): Gift_Pack_For_Woocommerce_Public->gpfw_check_gift_wrap_function('')

#2 /nas/content/live/wpsite/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)

#3 /nas/content/live/wpsite/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#4 /nas/content/live/wpsite/wp-admin/admin-ajax.php(203): do_action('wp_ajax_nopriv_...')

#5 {main}

thrown in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/partials/gift-pack-html.php on line 17

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: Creation of dynamic property Gift_Pack_For_Woocommerce_Admin::$current_language is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/admin/class-gift-pack-for-woocommerce-admin.php on line 56

[28-Jan-2024 01:37:10 UTC] PHP Deprecated: Creation of dynamic property Gift_Pack_For_Woocommerce_Public::$gpfw_options is deprecated in /nas/content/live/wpsite/wp-content/plugins/gift-pack-for-woocommerce/public/class-gift-pack-for-woocommerce-public.php on line 54

I’m not sure, but this may be related to the other open topic about a plugin conflict with ATUM Multi-Inventory, since that plugin is active.

The site is on WordPress 6.4.2, WooCommerce 8.5.2, and PHP 8.2.