My site crashed after update

Hello.
Usually white screen means that there is some kind of fatal error or maybe the memory is not enough to process the request.
It is recommended if you have WPML and WooCommerce Multilingual to use at least 128megabytes of memory for PHP.
In order to insure that you can set or change if already exists in wp-config.php
define( 'WP_MEMORY_LIMIT', '128M' );

If this is not the case with you, then you need to temporary enable debugging in WordPress.
You can do this by setting this options in wp-config.php
above the line that says:
/* That’s all, stop editing! Happy blogging. */

// Turn debugging on
define('WP_DEBUG', true);

// Tell WordPress to log everything to /wp-content/debug.log
define('WP_DEBUG_LOG', true);

// Turn off the display of error messages on your site
define('WP_DEBUG_DISPLAY', false);

// For good measure, you can also add the follow code, which will hide errors from being displayed on-screen
@ini_set('display_errors', 0);

Please do note to remove any other instances of this code if you have it in the file:

define('WP_DEBUG', false);

Enabling this, will create a debug.log file – which is a text file with the errors logged-in and it is located in /wp-content/debug.log on your site.

That error log can help us determine the cause of the issue and it would be very nice of you if you can provide it to us so that we can help you with the problem.