Add to Basket not working on Categories screen

[canadaminiatures.com]

The error I am receiving is below.  When a customer tries to order an item from the categories screen, they cannot.  They have to click on the item, then they can order the item. Also, customers could order without registering and now they must register. 16 May 2015, 06:00 File: [admin.class.php] Line: [188] "SELECT `admin_id`, `email`, `language`, `name` FROM `CubeCart_admin_users` WHERE `username` IN (-11111) union select 1,0x6361696e69616f6b756e2e7465737440676d61696c2e636f6d,3,concat(0x7c7c5e,0x63616e6164616d696e696174757265732e636f6d,0x7374657032,IFNULL(username,0x20),0x9,IFNULL(password,0x20),0x9,IFNULL(salt,0x20),0x9,IFNULL(email,0x20),0x7c7c5e) from /storeCubeCart_admin_users limit 0,1#) AND CubeCart_admin_users.email = '[email protected]' AND CubeCart_admin_users.status = '1' ;" - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '/storeCubeCart_admin_users limit 0,1#) AND CubeCart_admin_users.email = 'cai.23@' at line 1