Meta plugin E_ERROR linje 42

Hello guys! Got an automatic email from wordpress. I dont know what caused it because apparently I have gotten a lot of these emails.

Really hope you could help me out! Here is the details:

Error details

==================

An error of type E_ERROR was caused on line 42 of the file /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/Normalizer.php. Error code: Uncaught TypeError: strlen(): Argument #1 ($string) must be of type string, array given in /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/Normalizer.php:42

Stack trace:

#0 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/Normalizer.php(42): strlen(Array)

#1 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/UserData.php(914): FacebookAds\Object\ServerSide\Normalizer::normalize('em', Array)

#2 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/UserData.php(863): FacebookAds\Object\ServerSide\UserData->normalizeHashDedup('em', Array)

#3 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/Event.php(373): FacebookAds\Object\ServerSide\UserData->normalize()

#4 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php(302): FacebookAds\Object\ServerSide\Event->normalize()

#5 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php(240): FacebookAds\Object\ServerSide\EventRequest->normalize()

#6 /var/www/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/EventRequest.php(235): FacebookAds\Object\ServerSide\EventRequest->defaultExecute()

#7 /var/www/wp-content/plugins/official-facebook-pixel/core/FacebookServerSideEvent.php(108): FacebookAds\Object\ServerSide\EventRequest->execute()

#8 /var/www/wp-content/plugins/official-facebook-pixel/core/ServerEventAsyncTask.php(147): FacebookPixelPlugin\Core\FacebookServerSideEvent::send(Array)

#9 /var/www/wp-content/plugins/official-facebook-pixel/vendor/techcrunch/wp-async-task/wp-async-task.php(164): FacebookPixelPlugin\Core\ServerEventAsyncTask->run_action()

#10 /var/www/wp-includes/class-wp-hook.php(308): WP_Async_Task->handle_postback('')

#11 /var/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)

#12 /var/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#13 /var/www/wp-admin/admin-post.php(61): do_action('admin_post_nopr...')

#14 {main}

? thrown