Lost Tiki database connection

Sorry but there seems to be a problem connecting to the system's database

This may only be a temporary problem, so please wait a while and click retry to try and go back to the home page

If it persists you should contact your system administrator

Fatal error: Uncaught Error: Call to a member function query() on null in /var/www/html/lib/core/TikiDb/Bridge.php:27 Stack trace: #0 /var/www/html/tiki-setup_base.php(96): TikiDb_Bridge->query('SHOW TABLES LIK...') #1 /var/www/html/tiki-setup.php(60): require_once('/var/www/html/t...') #2 /var/www/html/tiki-calendar.php(12): require_once('/var/www/html/t...') #3 {main} thrown in /var/www/html/lib/core/TikiDb/Bridge.php on line 27