Fatal error: Uncaught Error: Call to undefined function is_product() in /www/wp-content/themes/serieuzezaken-child/functions.php:57 Stack trace: #0 /www/wp-includes/class-wp-hook.php(303): ts_redirect_product_pages(Object(WP)) #1 /www/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters('', Array) #2 /www/wp-includes/plugin.php(518): WP_Hook->do_action(Array) #3 /www/wp-includes/class-wp.php(763): do_action_ref_array('wp', Array) #4 /www/wp-includes/functions.php(1291): WP->main('') #5 /www/wp-blog-header.php(16): wp() #6 /www/index.php(17): require('/www/wp-blog-he...') #7 {main} thrown in /www/wp-content/themes/serieuzezaken-child/functions.php on line 57