Multible myslqi and Meekrodb errors

So I moved my Project from a Windows Server on a Linux Debian 11 and now I’m facing multiple mysqli and MeekroDB errors.
On Windows it all worked fine so far, Login worked with the DB-connection

I had to uncomment the extension=php_mysqli.dll for the Errors to disappear on Windows
On Linux i did all the same but get the following Errors

: mysqli::real_escape_string(): invalid object or resource mysqli in
/var/www/html/projectName/plugins/meekrodb/db.class.php
on line
703

Warning
: mysqli::query(): invalid object or resource mysqli in
/var/www/html/projectName/plugins/meekrodb/db.class.php
on line
792

Warning
: MeekroDB::queryHelper(): Property access is not allowed yet in
/var/www/html/projectName/plugins/meekrodb/db.class.php
on line
796

Warning
: MeekroDB::queryHelper(): Property access is not allowed yet in
/var/www/html/projectName/plugins/meekrodb/db.class.php
on line
797

Warning
: MeekroDB::queryHelper(): Property access is not allowed yet in
/var/www/html/projectName/plugins/meekrodb/db.class.php
on line
815

I double-checked if all packages are installed aswell, and without the DB-connection it works fine aswell just without the Data and User-Login