Plugin broken with update to WP 6.9

With upgrade to WP 6.9, the function get_thumbnail() throws a fatal error. I had to disable the plugin.

Fatal error: Uncaught Error: Call to a member function get_thumbnail() on null in /srv/public/wp-content/plugins/super-rss-reader/includes/feed.php:383 Stack trace: #0 /srv/public/wp-content/plugins/super-rss-reader/includes/feed.php(207): SRR_Feed->get_thumbnail_url(Object(SimplePie\Item), ”, ‘thumbnail’) #1 /srv/public/wp-content/plugins/super-rss-reader/includes/widget.php(50): SRR_Feed->html() #2 /srv/public/wp-content/plugins/super-rss-reader/includes/widget-admin.php(36): SRR_Widget::render_feed(Array) #3 /srv/public/wp-includes/class-wp-widget.php(394): super_rss_reader_widget->widget(Array, Array) #4 /srv/public/wp-includes/widgets.php(845): WP_Widget->display_callback(Array, Array) #5 /srv/public/wp-content/themes/onepress/sidebar.php(16): dynamic_sidebar(‘sidebar-1’) #6 /srv/public/wp-includes/template.php(814): require_once(‘/srv/users/shab…’) #7 /srv/public/wp-includes/template.php(749): load_template(‘/srv/users/shab…’, true, Array) #8 /srv/public/wp-includes/general-template.php(136): locate_template(Array, true, true, Array) #9 /srv/onepress/page.php(49): get_sidebar() #10 /srv/public/wp-includes/template-loader.php(125): include(‘/srv/users/shab…’) #11 /srv/public/wp-blog-header.php(19): require_once(‘/srv/users/shab…’) #12 /srv/public/index.php(17): require(‘/srv/users/shab…’) #13 {main} thrown in /srv/public/wp-content/plugins/super-rss-reader/includes/feed.php on line 383