Plugin generates fatal errors occasionally

I’ve seen these errors in my log for awhile now, so finally letting you know. They happen randomly. If you need any debug or other info just let me know:

[Jun 18, 22:37:42] PHP Fatal error: Uncaught Error: Call to undefined function show_message() in /wp-admin/includes/class-wp-upgrader-skin.php:161
Stack trace:
WP_Upgrader_Skin->feedback(‘Downloading upd…’, ‘https://downloa…’) /home/nginx/domains/mydomain.com/public/wp-admin/includes/class-wp-upgrader.php:277
WP_Upgrader->download_package(‘https://downloa…’, true) /home/nginx/domains/mydomain.com/public/wp-admin/includes/class-wp-upgrader.php:734
WP_Upgrader->run(Array) /home/nginx/domains/mydomain.com/public/wp-admin/includes/class-plugin-upgrader.php:186
Plugin_Upgrader->upgrade(‘404-solution/40…’) /home/nginx/domains/mydomain.com/public/wp-content/plugins/404-solution/includes/DatabaseUpgradesEtc.php:258
ABJ_404_Solution_DatabaseUpgradesEtc->doUpdatePlugin(Array) /home/nginx/domains/mydomain.com/public/wp-content/plugins/404-solution/includes/DatabaseUpgradesEtc.php:236
/home/nginx/domains/mydomain.com/public/wp-content/plugin in /home/nginx/domains/mydomain.com/public/wp-admin/includes/class-wp-upgrader-skin.php on line 161