Stop lesson to quiz redirect

In certain WordPress setups, Sensei automatically redirects the lesson page to its quiz. This snippet helps you to stop that:

add_action('template_redirect', 'custom_remove_sensei_quiz_view');
function custom_remove_sensei_quiz_view(){
if( is_singular('quiz') ){
global $post;
//redirect back to the lesson page
$lesson_id = $post->post_parent;
//make sure this does not run again
$lesson_link = add_query_arg( 'sa', '1', get_permalink( $lesson_id ) );
wp_redirect( $lesson_link );
add_filter( 'wp_redirect', 'custom_sensei_stop_redirect_loop', 0, 2 );
function custom_sensei_stop_redirect_loop( $location, $status ){
$block_redirect = get_query_var( 'sa', '0' );
if( '1' == $block_redirect ){
$location = false;
return $location;

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