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 = '5c9eee804f285f2f1ee997ef2175f1e0' AND u.user_id = s.session_user_id

Line : 239
File : /home/ju34431/html/forum/includes/sessions.php