プラグインを有効化にし、maintenance or coming soon pageの設定をすると下記のエラーが出ます。
Fatal error: Uncaught Error: Call to a member function get_page_permastruct() on null in ???/wp-includes/link-template.php:430 Stack trace: #0 ???/wp-includes/link-template.php(392): _get_page_link(Object(WP_Post), false, false) #1 ???/public_html/word/press1/wp-includes/link-template.php(197): get_page_link(Object(WP_Post), false, false) #2 ???/wp-content/plugins/wp-optimize/cache/class-wpo-page-cache.php(1018): get_permalink(Object(WP_Post)) #3 ???/wp-content/plugins/wp-optimize/cache/class-wpo-cache-rules.php(162): WPO_Page_Cache::delete_single_post_cache(4109) #4 ???/wp-includes/class-wp-hook.php(309): WPO_Cache_Rules->purge_post_on_update(4109) #5 ???/wp-includes/class-wp-hook.php(33 in ???/wp-includes/link-template.php on line 430
何とかしてください！！
