Personalizar Aparência

aparece o seguinte erro

Fatal error: Uncaught Error: Call to a member function push_to_queue() on null in /home/enrico/www/www.importshed/wordpress/wp-content/plugins/ewww-image-optimizer/common.php:8858 Stack trace: #0 /home/enrico/www/www.importshed/wordpress/wp-content/plugins/ewww-image-optimizer/common.php(8981): ewww_image_optimizer_add_attachment_to_queue() #1 /home/enrico/www/www.importshed/wordpress/wp-includes/class-wp-hook.php(326): ewww_image_optimizer_resize_from_meta_data() #2 /home/enrico/www/www.importshed/wordpress/wp-includes/plugin.php(205): WP_Hook->apply_filters() #3 /home/enrico/www/www.importshed/wordpress/wp-admin/includes/image.php(764): apply_filters() #4 /home/enrico/www/www.importshed/wordpress/wp-admin/includes/media.php(517): wp_generate_attachment_metadata() #5 /home/enrico/www/www.importshed/wordpress/wp-includes/class-wp-customize-manager.php(1400): media_handle_sideload() #6 /home/enrico/www/www.importshed/wordpress/wp-includes/class-wp-hook.php(324): WP_Customize_Manager->import_theme_starter_content() #7 /home/enrico/www/www.importshed/wordpress/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #8 /home/enrico/www/www.importshed/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action() #9 /home/enrico/www/www.importshed/wordpress/wp-settings.php(682): do_action() #10 /home/enrico/www/www.importshed/wordpress/wp-config.php(100): require_once(‘…’) #11 /home/enrico/www/www.importshed/wordpress/wp-load.php(50): require_once(‘…’) #12 /home/enrico/www/www.importshed/wordpress/wp-admin/admin.php(34): require_once(‘…’) #13 /home/enrico/www/www.importshed/wordpress/wp-admin/customize.php(13): require_once(‘…’) #14 {main} thrown in /home/enrico/www/www.importshed/wordpress/wp-content/plugins/ewww-image-optimizer/common.php on line 8858