ispconfig job queue not processing after upgraded to php 5.6

Hi,
i upgraded from php 5.4 to php 5.6.
The jobqueue isn't processing now.
When i try to run directly "/usr/local/ispconfig/server/server.sh" i get " Class 'mysqli' not found in /usr/local/ispconfig/server/lib/classes/db_mysql.inc.php on line 31"
php -v ----> php 5.6
but the sites are running under php 5.4 (get with phpinfo()
how can i repair this error?i'd like to run php5.6 on whole server. ispconfig version: 3.0.5.4p9
Thanks for your help!

 

try apt-get install php5-mysql. When upgrade the server-php, you may have brokem some requirement.