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 ('59b81ceb615295a29d2a44a7f02ed4e7', -1, 1425586302, 1425586302, '365cf5b9', -1, 0, 0)

Line : 187
File : sessions.php