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 ('98f84057e4d0d8244d8c0feeee4a9fec', -1, 1438236257, 1438236257, '36f23fd6', -1, 0, 0)

Line : 187
File : sessions.php