Call to Member function on a non-object
 

I created a class to handle my groups info. But when I try to get the info from the db I get.

Call to a member function query_read() on a non-object

Is there a special way to call $db->query_first_slave() or query_read from inside a custom class?

It kinda depends. I can't really say since you haven't posted what you wrote. Could be:

I figured it out, when I created the class I passed the object $vbulletin in, then checked that it was an object and if so assigned it to $this->registry

I was doing exactly what you was showing, but it didn't work