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 ('a9cada806fee7aa28c1ee38ad4066648', -1, 1425367082, 1425367082, '3652bdf8', -12, 0, 0)

Line : 187
File : sessions.php