PHP error

I keep getting PHP errors when I try and build test DB's.

I can create records, but when I try and edit, I get the following:
Error type 256

Error description Unknown column '' in 'where clause'

URL www.marketingbytes.com/photosphere/contact_info_edit.phpeditid=

Error file /home/bytes/public_html/photosphere/include/dbconnection.php

Error line 26

SQL query select `id`, `first`, `last`, `first_last`, `company`, `address`, `state`, `country`, `zipcode`, `telephone`, `fax`, `email_main`, `email_alternate`, `url`, `city` From `contact_info` where ``=NULL
Any thoughts, suggestions?

Thanks in advance for any help.
A.