Creating Plugin Error when adding query

[Jay- D]

I'm writing my first plugin. I got to the point where my static code needed to be ported to the database. When I added in some simple code:

PHP Code:

$j = $vbulletin->db->query_first_slave("SELECT 1+1"); 


This is just some test code, but it displays a white screen. No info, nothing. I'm guessing it's a 500 internal error. I have debugging on as well, with nothing be printed to screen. No logs are being created.

Does anyone have any advice?

Jay