Yourls 1.7.4
Ubuntu 18.04
MySQL 5.7.25
php 7.2.15

Loading the plugin produces this error:

(I can get the plugin to load by not using the user/cache.php file, and caching does seem to work, but the same error is produced when I attempt to edit or delete a URL.)

Next Error: Cannot access protected property YOURLS\Database\YDB::$infos in /var/www/xxxxxx/user/plugins/yapcac he/plugin.php:139 Stack trace: #0 /var/www/xxx in /var/www/xxxxxx/user/plugins/yapcache/plugin.php on line 139 [04-Mar-2019 19:25:56 UTC] PHP Fatal error: Uncaught Error: Cannot access protected property YOURLS\Database\YDB ::$infos in /var/www/xxxxxx/user/plugins/yapcache/plugin.php:139 Stack trace: #0 /var/www/xxxxxx/includes/functions-plugins.php(152): yapc_pre_get_keyword(Array) #1 /var/www/xxxxxx/includes/functions-plugins.php(191): yourls_apply_filter('pre_get_keyword', Array) #2 /var/www/xxxxxx/includes/functions.php(459): yourls_do_action('pre_get_keyword', 'mastering-colla...', true) #3 /var/www/xxxxxx/includes/functions.php(494): yourls_get_keyword_infos('mastering-colla...') #4 /var/www/xxxxxx/includes/functions.php(516): yourls_get_keyword_info('mastering-colla...', 'url', false) #5 /var/www/xxxxxx/includes/functions-html.php(483): yourls_get_keyword_longurl('mastering-colla...') #6 /var/www/xxxxxx/admin/admin-ajax.php(25): yourls_table_edit_row('mastering-colla...') #7 {main}