phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 2013 Lost connection to MySQL server during query

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '720b1e1db50b900bef47f5c03bfa9c5b' AND u.user_id = s.session_user_id

Line : 397
File : sessions.php