Fatal TypeError on guest wishlist (probably since 2.3.1 / WC 7.4.0)

Hi folks

First thanks for your amazing plugin! It worked like a charm but now i experiencing some fatal error. Could be because of the latest update on your plugin to 2.3.1 or updating to latest WooCommerce Version 7.4.0.
Seems to only apply to guest wishlist when not logged in, as soon as i use an account it does display my lists properly.

This is the stacktrace:
Fatal error: Uncaught TypeError: Unsupported operand types: string * string in /wp-content/plugins/ti-woocommerce-wishlist-premium/public/wishlist/view.class.php:840 Stack trace: #0 /wp-content/plugins/ti-woocommerce-wishlist-premium/public/wishlist/view.class.php(573): TInvWL_Public_Wishlist_View->get_subtotal_price(Array) #1 /wp-content/plugins/ti-woocommerce-wishlist-premium/public/wishlist/view.class.php(780): TInvWL_Public_Wishlist_View->htmloutput(Array) #2 /wp-content/plugins/ti-woocommerce-wishlist-premium/tinv-wishlists-function.php(713): TInvWL_Public_Wishlist_View->shortcode(Array) #3 /wp-includes/shortcodes.php(355): tinvwl_shortcode_view('', '', 'ti_wishlistsvie...') #4 [internal function]: do_shortcode_tag(Array) #5 /wp-includes/shortcodes.php(227): preg_replace_callback('/\\[(\\[?)(ti_wis...', 'do_shortcode_ta...', '[ti_wishlistsvi...') #6 /wp-includes/class-wp-hook.php(308): do_shortcode('[ti_wishlistsvi...') #7 /wp-includes/plugin.php(205): WP_Hook->apply_filters('[ti_wishlistsvi...', Array) #8 /wp-includes/post-template.php(255): apply_filters('the_content', '[ti_wishlistsvi...') #9 /wp-content/themes/floradiberna/template-parts/content.php(30): the_content('Continue readin...') #10 /wp-includes/template.php(785): require('/home/httpd/vho...') #11 /wp-includes/template.php(718): load_template('/home/httpd/vho...', false, Array) #12 /wp-includes/general-template.php(204): locate_template(Array, true, false, Array) #13 /wp-content/themes/floradiberna/index.php(11): get_template_part('template-parts/...', '') #14 /wp-includes/template-loader.php(106): include('/home/httpd/vho...') #15 /wp-blog-header.php(19): require_once('/home/httpd/vho...') #16 /index.php(17): require('/home/httpd/vho...') #17 {main} thrown in /wp-content/plugins/ti-woocommerce-wishlist-premium/public/wishlist/view.class.php on line 840

Some core information on my setup

• WordPress 6.1.1
• PHP 8.0
• TI Wishliste Premium (activated) 2.3.1
• WooCommerce 7.4.0
• Using custom translationg with LocoTranslate
• Template is a fully custom template but without any overrides to your Plugins / no active hooks & filters applied

If you need access to the backend, let me know ??

Thanks & Greets Chris

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