Failed to execute the SQL query

select  c.id, c.title, c.url, c.siteurl, f.name, c.parent, c.icon, c.descr, c.mode  from  channels  c inner join  folders  f on f.id = c.parent and not(c.mode & 4)  and not(c.mode & 8)  order by f.position asc, c.position asc

Error 2013: Lost connection to MySQL server during query