Errors thrown and add-ons not collapsed

[06-Feb-2023 14:14:44 UTC] PHP Fatal error: Uncaught TypeError: stripslashes(): Argument #1 ($string) must be of type string, array given in /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-content/plugins/yith-woocommerce-product-add-ons/includes/class-yith-wapo-cart.php:191
Stack trace:

0 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-content/plugins/yith-woocommerce-product-add-ons/includes/class-yith-wapo-cart.php(191): stripslashes(Array)

1 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-content/plugins/yith-woocommerce-product-add-ons/includes/class-yith-wapo-cart.php(114): YITH_WAPO_Cart->add_cart_item(Array)

2 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-includes/class-wp-hook.php(310): YITH_WAPO_Cart->get_cart_item_from_session(Array, Array)

3 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)

4 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-content/plugins/woocommerce/includes/class-wc-cart-session.php(196): apply_filters('woocommerce_get…', Array, Array, 'db0df8007a42f3b…')

5 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-includes/class-wp-hook.php(308): WC_Cart_Session->get_cart_from_session('')

6 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)

7 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

8 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-settings.php(639): do_action('wp_loaded')

9 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-config.php(86): require_once('/homepages/27/d…')

10 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-load.php(50): require_once('/homepages/27/d…')

11 /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-admin/admin-ajax.php(22): require_once('/homepages/27/d…')

12 {main}

thrown in /homepages/27/d297592606/htdocs/clickandbuilds/ReliantShirtsdemo/wp-content/plugins/yith-woocommerce-product-add-ons/includes/class-yith-wapo-cart.php on line 191

Errors above are thrown when V2.18.0 of your plugin (free) is installed.

Also note that when selected V2 of the interface the options all appear on the product page expanded, though they are collapsed using V1.4 – is this a setting issue or am I missing something?