Fatal error since MySQL update

I just updated my Ubuntu server and I kept a blank page in Drupal with this message:

The website encountered an unexpected error. Please try again later.

What should I do ?

Type 	php
Date 	Mardi, 23 juillet, 2019 - 01:25
User 	administrateur
Emplacement 	https://www.example.com/fr/article
Référent 	
Message 	Drupal\Core\Database\DatabaseExceptionWrapper : SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'member ON member.entity_id = thread.id AND member.members_target_id = '1' JOIN g' at line 1: SELECT COUNT(DISTINCT thread.id) FROM {private_messages} AS message JOIN {private_message_thread__private_messages} AS thread_message ON message.id = thread_message.private_messages_target_id JOIN {private_message_threads} AS thread ON thread_message.entity_id = thread.id JOIN {private_message_thread__members} AS member ON member.entity_id = thread.id AND member.members_target_id = :uid JOIN {private_message_thread__last_access_time} AS last_access ON last_access.entity_id = thread.id JOIN {pm_thread_access_time} as access_time ON access_time.id = last_access.last_access_time_target_id AND access_time.owner = :uid AND access_time.access_time <= thread.updated WHERE thread.updated > :timestamp AND message.created > :timestamp AND message.owner <> :uid; Array ( [:uid] => 1 [:timestamp] => 1563519558 ) dans Drupal\private_message\Mapper\PrivateMessageMapper->getUnreadThreadCount() (ligne 266 de /var/www/www-example-com/web/modules/contrib/private_message/src/Mapper/PrivateMessageMapper.php).
Severity 	Erreur

If I disable the Private Message notification block, the site works.