phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 1194 Table 's' is marked as crashed and should be repaired

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '0f55817c19be8d047a465e44768f8f6a' AND u.user_id = s.session_user_id

Line : 247
File : sessions.php