WP-Admin unavailable due to Snapshot issues


our client reports blank screen on login page, so I've activated debug and got the following error on login:

Notice: Indirect modification of overloaded element of WP_Hook has no effect in /home/b80063/public_html/ledorf.de/wp/wp-content/plugins/snapshot/lib/WPMUDEV/Dashboard/wpmudev-dash-notification.php on line 58

Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 49152 bytes) in /home/b80063/public_html/ledorf.de/wp/wp-content/plugins/membership/app/model/class-ms-model-communication.php on line 1470

Is this a snapshot bug or anything I should fix on hosting-level?

Thank you and kind regards,