Undefined Index in WPMUDEV Update Plugin

Notice: Undefined index: page in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/wpmudev-updates/notifications.php on line 53 Notice: Undefined variable: msg in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/wpmudev-updates/notifications.php on line 76

did you forget the ' ' ?