php 8 issue

Fatal error: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given in /home/sitename/public_html/wp-content/plugins/wp-dark-mode/includes/class-enqueue.php:87 Stack trace: #0 /home/sitename/public_html/wp-content/plugins/wp-dark-mode/includes/class-enqueue.php(87): method_exists(NULL, ‘is_block_editor’) #1 /home/sitename/public_html/wp-content/plugins/wp-dark-mode/includes/class-enqueue.php(57): WP_Dark_Mode_Enqueue->frontend_localize() #2 /home/sitename/public_html/wp-includes/class-wp-hook.php(287): WP_Dark_Mode_Enqueue->frontend_scripts(”) #3 /home/sitename/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #4 /home/sitename/public_html/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #5 /home/sitename/public_html/wp-includes/script-loader.php(2004): do_action(‘wp_enqueue_scri…’) #6 /home/sitename/public_html/wp-includes/class-wp-hook.php(287): wp_enqueue_scripts(”) #7 /home/sitename/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array) #8 /home/sitename/public_html/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #9 /home/sitename/public_html/wp-includes/general-template.php(3005): do_action(‘wp_head’) #10 /home/sitename/public_html/wp-content/themes/responsive/header.php(42): wp_head() #11 /home/sitename/public_html/wp-includes/template.php(730): require_once(‘/home/sitename/p…’) #12 /home/sitename/public_html/wp-includes/template.php(676): load_template(‘/home/sitename/p…’, true, Array) #13 /home/sitename/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #14 /home/sitename/public_html/wp-content/themes/responsive/front-page.php(44): get_header() #15 /home/sitename/public_html/wp-includes/template-loader.php(106): include(‘/home/sitename/p…’) #16 /home/sitename/public_html/wp-blog-header.php(19): require_once(‘/home/sitename/p…’) #17 /home/sitename/public_html/index.php(17): require(‘/home/sitename/p…’) #18 {main} thrown in /home/sitename/public_html/wp-content/plugins/wp-dark-mode/includes/class-enqueue.php on line 87
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