500 - JDatabaseMySQL::query: 1064 error

I know this is an old one, but I didn't see an easy response anywhere out there. In my case I had a similar problem to Rhand, I enabled debug mode and got the 500 error on the entire site, including the admin login page - so I couldn't disable it. I had to go digging and I found the debug setting myself.
Go to configuration.ini and set line 7 to :
var $debug = '0';