To redirect 404 error to homepage you may add the little snippet code to your functions.php
/**
* WordPress 404 Redirect to Home
*/
function homepage_redirect_404() {
global $wp_query;
if ( $wp_query->is_404 ) {
wp_redirect( get_bloginfo( 'wpurl' ), 301 );
exit;
}
}
add_action( 'template_redirect', 'homepage_redirect_404', 1 );
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