PHP Fatal error: Uncaught Error: Call to undefined function mysqli_report

What is this error telling me? i need a solution to solve this.

This is after i upgraded to 2.3.4 straight from 2.2.16.

Code:

PHP Fatal error: Uncaught Error: Call to undefined function mysqli_report() in /var/www/vhosts/unifi-forum.nl/httpdocs/src/XF.php:160 Stack trace: #0 /var/www/vhosts/unifi-forum.nl/httpdocs/src/XF.php(112): XF::standardizeEnvironment() #1 /var/www/vhosts/unifi-forum.nl/httpdocs/socket_server.php(11): XF::start('...') #2 {main} thrown in...

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