If your site crashes or if you only see a white screen after plugin activation, please turn on wp debug log.
Add the following lines to your wp-config.php:
define( 'WP_DEBUG', true ); define( 'WP_DEBUG_DISPLAY', false ); define( 'WP_DEBUG_LOG', true );
The log file is under wp-content/debug.log. Maybe you already see where the error is. Something like memory error can be fixed by increasing php memory_limit in php.ini or with adding this to your .htaccess:
php_value memory_limit 512M
If you do not know what the error is, send it to [email protected]