Regular Show: Spot the difference

Fatal error: Uncaught TypeError: preg_replace(): Argument #3 ($subject) must be of type array|string, null given in /www/wwwroot/games.doomsplay.com/wp-content/plugins/wp-rocket/inc/Dependencies/RocketLazyload/Image.php:27 Stack trace: #0 /www/wwwroot/games.doomsplay.com/wp-content/plugins/wp-rocket/inc/Dependencies/RocketLazyload/Image.php(27): preg_replace() #1 /www/wwwroot/games.doomsplay.com/wp-content/plugins/wp-rocket/inc/Engine/Media/Lazyload/Subscriber.php(375): WP_Rocket\Dependencies\RocketLazyload\Image->lazyloadImages() #2 /www/wwwroot/games.doomsplay.com/wp-includes/class-wp-hook.php(308): WP_Rocket\Engine\Media\Lazyload\Subscriber->lazyload() #3 /www/wwwroot/games.doomsplay.com/wp-includes/plugin.php(205): WP_Hook->apply_filters() #4 /www/wwwroot/games.doomsplay.com/wp-content/plugins/wp-rocket/inc/classes/Buffer/class-optimization.php(104): apply_filters() #5 [internal function]: WP_Rocket\Buffer\Optimization->maybe_process_buffer() #6 /www/wwwroot/games.doomsplay.com/wp-includes/functions.php(5279): ob_end_flush() #7 /www/wwwroot/games.doomsplay.com/wp-includes/class-wp-hook.php(308): wp_ob_end_flush_all() #8 /www/wwwroot/games.doomsplay.com/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #9 /www/wwwroot/games.doomsplay.com/wp-includes/plugin.php(517): WP_Hook->do_action() #10 /www/wwwroot/games.doomsplay.com/wp-includes/load.php(1124): do_action() #11 [internal function]: shutdown_action_hook() #12 {main} thrown in /www/wwwroot/games.doomsplay.com/wp-content/plugins/wp-rocket/inc/Dependencies/RocketLazyload/Image.php on line 27