few days ago i`ve updated my wordpress multisite into newest version.
Problem is, that now i see "Cannot modify header information headers already sent by (output started at /index.php:2) in /wp-content/mu-plugins/domain_mapping.php on line 724" when i try to see example blog on my WP multisite via "secondary" domain. Primary domain works fine, secondary don`t
Domain mapping plugin version is 0.5.4.2
Could you please help me?