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 ('0b59bf9c4b96d11ff9560555b1ce39c9', -1, 1438364314, 1438364314, '36a724dd', -1, 0, 0)

Line : 187
File : sessions.php