DB Error: syntax error

[db_error: message="DB Error: syntax error" code=-2 mode=return level=notice prefix="" info="select * from sites where tag in ('bill_o'neill') order by priority asc [nativecode=1064 ** 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 'neill') order by priority asc' at line 1]"]