PHP 8 compatibility

I’m testing my site with PHP 8.1 and it seems the LuckyWP Table of Contents plugin is throwing a fatal error. When I disable the plugin the site loads normally. This is from my debug log with the plugin enabled (server path deleted for security):

[20-Sep-2022 17:58:16 UTC] PHP Fatal error:  Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given in /public_html/wp-includes/class-wp-hook.php:307
Stack trace:
#0 /public_html/wp-includes/plugin.php(191): WP_Hook->apply_filters()
#1 /public_html/wp-content/plugins/luckywp-table-of-contents/front/Front.php(49): apply_filters()
#2 /public_html/wp-content/plugins/luckywp-table-of-contents/front/Toc.php(305): luckywp\tableOfContents\front\Front->enqueueAssets()
#3 /public_html/wp-content/plugins/luckywp-table-of-contents/plugin/Shortcode.php(198): luckywp\tableOfContents\front\Toc::render()
#4 [internal function]: luckywp\tableOfContents\plugin\Shortcode->luckywp\tableOfContents\plugin\{closure}()
#5 /public_html/wp-content/plugins/luckywp-table-of-contents/plugin/Shortcode.php(199): preg_replace_callback()
#6 /public_html/wp-includes/class-wp-hook.php(307): luckywp\tableOfContents\plugin\Shortcode->theContent()
#7 /public_html/wp-includes/plugin.php(191): WP_Hook->apply_filters()
#8 /public_html/wp-includes/post-template.php(253): apply_filters()
#9 /public_html/wp-content/themes/nm2021/single.php(17): the_content()
#10 /public_html/wp-includes/template-loader.php(106): include('/home/...')
#11 /public_html/wp-blog-header.php(19): require_once('/home/...')
#12 /public_html/index.php(17): require('/home/...')
#13 {main}
  thrown in /public_html/wp-includes/class-wp-hook.php on line 307