Trying to access array offset on value of type bool in Setup.php:563

Hi Everyone,

This caught my eye when running one of my maintenance scripts. The
Setup.php:563 warning is new.

The warning was not present on the old CentOS machine. The new machine
is Ubuntu 20, PHP 7.4, MySQL 8, Mediawiki 1.35.1.

# php /var/www/html/w/maintenance/generateSitemap.php ...

PHP Notice:  Trying to access array offset on value of type bool in
/var/www/html/w/includes/Setup.php on line 563
Wikimedia\Rdbms\DBConnectionError from line 1420 of
/var/www/html/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php:
Cannot access the database: Unknown error (localhost)
#0 /var/www/html/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(934):
Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/html/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(901):
Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /var/www/html/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1046):
Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /var/www/html/w/maintenance/includes/Maintenance.php(1371):
Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /var/www/html/w/maintenance/generateSitemap.php(200): Maintenance->getDB()
#5 /var/www/html/w/maintenance/doMaintenance.php(107):
GenerateSitemap->execute()
#6 /var/www/html/w/maintenance/generateSitemap.php(564):
require_once('/var/www/html/w...')
#7 {main}

I think the exception is expected and due to some troubles with our
system users.

Jeff

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