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Fatal error: Uncaught Error: Call to undefined function is_user_logged_in() in /home/slogapla/public_html/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php:59 Stack trace: #0 /home/slogapla/public_html/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php(26): WPO_Page_Optimizer->maybe_remove_unused_css() #1 [internal function]: WPO_Page_Optimizer->optimize() #2 /home/slogapla/public_html/wp-includes/functions.php(5471): ob_end_flush() #3 /home/slogapla/public_html/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all() #4 /home/slogapla/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #5 /home/slogapla/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /home/slogapla/public_html/wp-includes/load.php(1304): do_action() #7 [internal function]: shutdown_action_hook() #8 {main} thrown in /home/slogapla/public_html/wp-content/plugins/wp-optimize/includes/class-wpo-page-optimizer.php on line 59