Error in User controll panel

When I try to my own orders in the public user control panel I get
Fatal error: Class '' not found in /mydomain bla bla bla/public_html/libraries/joomla/database/database/mysqli.php on line 462

Which version of joomla are you using ?
Could you try to switch the database driver to MySQL instead of MySQLi in the configuration of Joomla ?

Changed to MySQL instead but the problem remains.

I use Joomla 1.6.3 and Hikashop 1.5.4

I think that the problem comes from joomfish tables in your database.

Could you change the line:
if(!$app->isAdmin() && $translationHelper->isMulti(true)){
to:
if(!$app->isAdmin() && $translationHelper->isMulti(true) && class_exists('JFDatabase')){
in the file administrator/components/com_hikashop/types/categorysub.php and try again ?

Hi,
I do not have joomfish installed and i have joomla 1.7.3
I have a similar problem, tried this solution, i still have the same error!
/libraries/joomla/database/database/mysql.php on line 652

That message doesn't give enough information to move forward.
Could you try to activate the debug mode of Joomla in the configuration of Joomla and try again ?
Do you get an error message with more information ? Could you do a screenshot maybe ?

Hi,
I have gave you access to my site and you have checked it and replied to me saying "We are still unable to reproduce the problem on our end in all the tests we did."
So i am still waiting for a solution from your end.
If you need to access my site or the FTP information please let me know.

That modification works. I've done it for you thanks to the FTP account you provided and it's now working.

Thank you very much
I have already made the modifications but when I noticed it did not help, I have uploaded the original file.
You must have done something which i have not done or maybe i have not done it correctly..
Thank you anyway