phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './allonssortir/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 ('c23e187d9c2691d6ec8cd2fa7783850c', -1, 1425408239, 1425408239, '3691ad39', -12, 0, 0)

Line : 187
File : sessions.php