defender crashing site

HI My clients site crashed with 550 error, having run through all plugins I managed to get into the file manager and delete the Defender program and the site came back up again

in the logs I was getting the following with memory being taken up - this just started happening is this an issue with an update for the plugin or something else ?

irishairandbeauty.co.uk [Wed Jan 11 19:16:32 2017] [error] [client 66.249.75.49:52384] AH01215: PHP Fatal error: Out of memory (allocated 200015872) (tried to allocate 10486049 bytes) in /home/sites/irishairandbeauty.co.uk/public_html/wp-includes/wp-db.php on line 1171: /home/sites/irishairandbeauty.co.uk/public_html/index.php
irishairandbeauty.co.uk [Wed Jan 11 19:16:50 2017] [error] [client 80.90.193.161:33917] AH01215: PHP Fatal error: Out of memory (allocated 200015872) (tried to allocate 10486049 bytes) in /home/sites/irishairandbeauty.co.uk/public_html/wp-includes/wp-db.php on line 1171: /home/sites/irishairandbeauty.co.uk/public_html/index.php
irishairandbeauty.co.uk [Wed Jan 11 19:16:50 2017] [error] [client 66.249.75.49:34482] AH01215: PHP Fatal error: Out of memory (allocated 199753728) (tried to allocate 10486049 bytes) in /home/sites/irishairandbeauty.co.uk/public_html/wp-includes/wp-db.php on line 1171: /home/sites/irishairandbeauty.co.uk/public_html/index.php

ive removed defender from my sites at moment

thanks

paul