Fatal error: Uncaught Error: Call to undefined function is_active_sidebar() in /home/magpolicki/public_html/magpolicki/wp-content/themes/twentythirteen/sidebar-main.php:12 Stack trace: #0 {main} thrown in /home/magpolicki/public_html/magpolicki/wp-content/themes/twentythirteen/sidebar-main.php on line 12