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 ('1879f242e3f534d9395b6863dc62d475', -1, 1436198318, 1436198318, '6b1657cd', -1, 0, 0)

Line : 187
File : sessions.php