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Fatal error: Uncaught Error: Call to undefined function is_user_logged_in() in /data/web/virtuals/4540/virtual/www/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php:59 Stack trace: #0 /data/web/virtuals/4540/virtual/www/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php(26): WPO_Page_Optimizer->maybe_remove_unused_css('<br />\n<b>Warni...') #1 [internal function]: WPO_Page_Optimizer->optimize('<br />\n<b>Warni...', 9) #2 /data/web/virtuals/4540/virtual/www/wp-includes/functions.php(5471): ob_end_flush() #3 /data/web/virtuals/4540/virtual/www/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all('') #4 /data/web/virtuals/4540/virtual/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #5 /data/web/virtuals/4540/virtual/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /data/web/virtuals/4540/virtual/www/wp-includes/load.php(1304): do_action('shutdown') #7 [internal function]: shutdown_action_hook() #8 {main} thrown in /data/web/virtuals/4540/virtual/www/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php on line 59