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 ('b849be1c8aa79eee38e7d0a12f2de6cd', -1, 1438547316, 1438547316, '36ea81d7', 5, 0, 0)

Line : 187
File : sessions.php