I get an error when I am trying to show a category, everything works but the error is visible in the bottom on the page.

 

Warning: mysqli_close() [function.mysqli-close]: Couldn't fetch mysqli in /var/www/training/libraries/joomla/database/database/mysqli.php on line 148

 

 

On row 148 in mysqli.php it sais:

mysqli_close($this->connection);

 

 

 

Can somebody help me with this?

No input for this problem?