Conflict with Snapshot plugin

Hello!

I use Snapshot plugin. When I enable Messeging plugin there is an error on Inbox page

Notice: Indirect modification of overloaded element of WP_Hook has no effect in /home/mydomain/domains/mydomain.pl/public_html/wp-content/plugins/snapshot/lib/WPMUDEV/Dashboard/wpmudev-dash-notification.php on line 58

I use PHP 5.6.26 and WP 4.7.2