phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './private_phpb1/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 ('42d65c91e2f6b3010fd7ccf446780604', -1, 1425016604, 1425016604, '36cd6ac0', 12, 0, 0)

Line : 187
File : sessions.php