phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpbb/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d5cb734bc9917843f93b1424c24caca6', -1, 1438460178, 1438460178, '36c49064', -1, 0, 0)

Line : 187
File : sessions.php